Answers created by Stefan V.

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A sample of a mineral contains $26.83 %$ $26.83%$ $KCl$ $"KCl"$ and $34.27 %$ $34.27%$ ${MgCl}_{2}$ $"MgCl"_2$ . Find the percentage of chlorine in this sample?
What is the number of moles in $36 g$ $"36 g"$ of $H_{2} O$ $"H"_2"O"$ ?
If the mole fraction of $NaCl$ $"NaCl"$ in a solution is $0.125$ $0.125$ , what is the percent by mass of $NaCl$ $"NaCl"$ ?
If the percentage yield of the given reaction is $30 %$ $30%$ , how many total moles of the gases will be produced if $8$ $8$ moles of ${NaNO}_{3}$ $"NaNO"_3$ are initially taken?
Are reviewers still featuring answers?
Calculate the wavelength of Radio 4 which broadcasts on a frequency of $198 kHz$ $"198 kHz"$ ?
Is there financial gain in the Socratic app?
Will there be an option to ask a question in the Socratic app once the Socratic website is set as "read only" in August?
Would it be possible for Socratic to support LaTeX in addition to the math formatter that is already included?
Will the Socratic team ever design a new badge for featured answers?
Titration problem?
What is the status of the Socratic app?
Is there a way for me to see my most viewed answers?
A question where my answer was the only one has over 60,000 views. Why is the number of students I have helped much less?
What is the difference between oxygenated and deoxygenated blood?
Is there any way to insert graph in comments?
How many questions are asked on Socratic in a day at an average?
Is there a meet-and-greet discussions thread in Socratic?
I have a question. Is Socratic on amazon? Because I have it on my iphone. But it would to be easier to use it on my kindle. Thanks!
Is there a possibility that we can zoom in on members' impact maps?
Will other languages be included as subjects in Socratic?
Adding maths formatting in a question?
Is there a Socratic app on the Windows Store?
What is the percent by mass of KBr if 58.2 grams are dissolved in 344 grams of water?
How many grams of glucose must be added to 275 g of water in order to prepare percent by mass concentration of aqueous glucose solution 1.30% ?
How many liters of 4.00 M solution can be made using exactly 100.0 grams of lithum bromide?
Write a balanced molecular, complete ionic, and net ionic equation for the reaction between "HBr" and $NaOH$ $"NaOH"$ ?
LaTeX/MathJax: How to format in biography and/or comments?
What is the $pH$ $"pH"$ of a $1.5-M$ $"1.5-M"$ solution of ammonia? The dissociation constant of ammonia at ${25.0}^{\circ} C$ $25.0^@"C"$ is $1.80 \cdot 10^{- 5}$ $1.80 * 10^-5$ .
Calculate the mass of ${CuSO}_{4} \cdot 5 H_{2} O$ $"CuSO"_4 * 5"H"_2"O"$ needed to prepare $100.00 mL$ $"100.00 mL"$ of a $0.05000-mol/L$ $"0.05000-mol/L"$ solution?
Old questions: quite often I'll work hard to answer a question, only to find it's from 2 years ago. I imagine that questioner isn't still waiting and checking for the answer! So, to maximise my time, how can I answer new questions over old ones?
The venom of biting ants contains formic acid, $HCOOH$ $"HCOOH"$ . What is the $pH$ $"pH"$ of a $0.0700-M$ $"0.0700-M"$ solution of formic acid?
How many grams of KI are required to make 550.0 mL of a 1.50 M KI solution ?
What is the MathJax coding system that Socratic Uses?
How to describe the electrons defined by the following quantum numbers?
Who has asked the most questions in Socratic?
If a solution is 0.5% (w/v), how many mg/ml is that?
A $25.0-mL$ $"25.0-mL"$ sample of ${0.150-mol L}^{- 1}$ $"0.150-mol L"^(-1)$ acetic acid is titrated with a ${0.150-mol L}^{- 1}$ $"0.150-mol L"^(-1)$ $NaOH$ $"NaOH"$ solution. What is the $pH$ $"pH"$ at the equivalence point?
A $25.0-mL$ $"25.0-mL"$ sample of ${0.150-mol L}^{- 1}$ $"0.150-mol L"^(-1)$ hydrofluoric acid is titrated with a ${0.150-mol L}^{- 1}$ $"0.150-mol L"^(-1)$ $NaOH$ $"NaOH"$ solution. What is the $pH$ $"pH"$ after $26.0 mL$ $"26.0 mL"$ of base is added?
How much (in $L$ $"L"$ ) of a $1.2-M$ $"1.2-M"$ $NaCl$ $"NaCl"$ solution must be used to dilute to create $1 L$ $"1 L"$ of a $0.12-M$ $"0.12-M"$ $NaCl$ $"NaCl"$ solution?
You have a $250.0-mL$ $"250.0-mL"$ sample of $1.00-M$ $"1.00-M"$ acetic acid. Assuming no volume change, how much $NaOH$ $"NaOH"$ must be added to make the best buffer? Calculate the $pH$ $"pH"$ of the best buffer.
Suppose you wanted a 2:25 dilution of a stock solution, but you wanted 200 ml of it. How would you make this?
A particular drain cleaner contains $NaOH$ $"NaOH"$ . What is the value of $[{OH}^{-}]$ $["OH"^(-)]$ in a solution produced when $15.0 g$ $"15.0 g"$ of $NaOH$ $"NaOH"$ dissolves in enough water to make $375 mL$ $"375 mL"$ of solution?
How many formula units make up $25.0 g$ $"25.0 g"$ of magnesium chloride?
If an electron has a spin quantum no. of $+1/2$ $"+1/2"$ and a magnetic quantum no. of $- 1$ $-1$ , it cannot be present in?
If 5.0 g of NaOH are dissolved in water to give 250.0 g total mass of solution, what is the % concentration (w/w)?
What is the $pH$ $"pH"$ of a $0.49-M$ $"0.49-M"$ $NaClO$ $"NaClO"$ solution?
What mass of a 0.337% KCN solution contains 696 mg of KCN? Thank you!
How many moles of $NaOH$ $"NaOH"$ were used to neutralize 0.0220 moles of $HCl$ $"HCl"$ if the mole ratio is $1/1$ $"1/1"$ ?
$20.0 mL$ $"20.0 mL"$ of glacial acetic acid (pure ${CH}_{3} COOH$ $"CH"_3"COOH"$ ) is diluted to $1.30 L$ $"1.30 L"$ with water. The density of glacial acetic acid is $1.05 g/mL$ $"1.05 g/mL"$ . What is the pH of the resulting solution?
Calculate the amount of heat evolved in the complete oxidation of $8.17 g$ $"8.17 g"$ of $Al$ $"Al"$ $(M_{M} = 26.98 g/mol)$ $(M_M = "26.98 g/mol")$ at $25^{\circ} C$ $25^@"C"$ and $1 atm$ $"1 atm"$ pressure?
Calculate the $pH$ $"pH"$ of a solution when $1 g$ $"1 g"$ of acetic acid and $4 g$ $"4 g"$ of sodium hydroxide are dissolved in $2 L$ $"2 L"$ of water?
An electron has the following quantum number values: n = 3, l = 1, ml = 0. Which of the following notations represents the most likely location of this electron?
In the production of sulfuric acid, what is the limiting reagent when $1.30$ $1.30$ moles of $S$ $"S"$ react with $8.80$ $8.80$ moles of ${HNO}_{3}$ $"HNO"_3$ ?
A loaf of bread has a volume of ${2270 cm}^{3}$ $"2270 cm"^3$ and a mass of $454 g$ $"454 g"$ . What is the density of the bread?
A buffer solution was prepared by mixing $392 mL$ $"392 mL"$ of $0.301 M$ $"0.301 M"$ $NaClO$ $"NaClO"$ and $181 mL$ $"181 mL"$ of $0.281 M$ $"0.281 M"$ $HClO$ $"HClO"$ . Calculate the $pH$ $"pH"$ of the solution?
What volume of 0.1292 M NaOH is needed to neutralize 25.00 mL of HCl of unknown concentration?
The equivalent weight of metal is triple to that of oxygen. What is the ratio of weight of its oxide to that of metal?
What is the molarity of a solution that contains 3.25 moles of $KCl$ $"KCl"$ in 2.25 L of the solution?
Calculate the pH during a titration when 9.54 mL of a 0.15 M HCl solution has reacted with 22.88 mL of 0.14 M NaOH?
A concept that will help both the "answerers" and the "questioners." Why don't Socratic developers add a website-like format where Socratic members build a website on ways of solving problems?
What is the partial pressure of $O_{2}$ $"O"_2$ in air at $1 atm$ $"1 atm"$ given that $21 %$ $21%$ of air molecules are $O_{2}$ $"O"_2$ ?
How many grams of silver chloride can be produced if you start with $4.62 g$ $"4.62 g"$ of barium chloride?
When limestone, which is principally ${CaCO}_{3}$ $"CaCO"_3$ , is heated, carbon dioxide and quicklime are produced by the reaction?
How many water molecules are in 4.0 moles of water?
What is the mass, in grams, of $1.24$ $1.24$ moles of water, $H_{2} O$ $"H"_2"O"$ ?
Calculate the mass of carbon dioxide that contains the same number of atoms of oxygen as present in $1.8 g$ $"1.8 g"$ of water?
Is there any way to send a picture of the question?
Calculate the concentration of an ammonia $(M_{M} = 17 g/mol)$ $(M_M = "17 g/mol")$ solution that is $15 %$ $15%$ ${NH}_{3}$ $"NH"_3$ and has a density of $0.90 g/mL$ $"0.90 g/mL"$ ?
Which of the following sets of quantum numbers are not permitted?
What values of $m_{l}$ $m_l$ are permitted for an electron with $l = 3$ $l=3$ ?
A liter of air containing 1% Ar is repeatedly passed over hot Cu and hot Mg till no reduction of volume takes place. The final volume of Ar will be?
What is the chemical name for ${Na}_{2} O$ $"Na"_2"O"$ ?
One of the chlorophylls, chlorophyll a, has four nitrogen atoms in a molecule, and the mass fraction of nitrogen is 6.27%. What is the relative molar mass of chlorophyll a?
What mass of $NaBr$ $"NaBr"$ is needed to prepare $50.00 mL$ $"50.00 mL"$ of a $6.5 %$ $6.5%$ (m/v) solution in distilled water?
What are the possible values of quantum number ℓ when n =1 ?
Will it ever be possible to view unanswered questions for a certain topic?
What is the mass of $1.2 \cdot 10^{18}$ $1.2*10^18$ formula units of calcium chloride?
A mixture of $2.00$ $2.00$ moles of $H_{2}$ $"H"_2$ , $3.00$ $3.00$ moles of ${NH}_{3}$ $"NH"_3$ , $4.00$ $4.00$ moles of ${CO}_{2}$ $"CO"_2$ , and $5.00$ $5.00$ moles of $N_{2}$ $"N"_2$ exerts a total pressure of $800. mmHg$ $"800. mmHg"$ . What is the partial pressure of each gas?
$1.00 \cdot 10^{2}$ $1.00 *10^2$ $mL$ $"mL"$ of a $12.4-M$ $"12.4-M"$ $HCl$ $"HCl"$ solution is added to water to bring the total volume of the solution to $0.820 L$ $"0.820 L"$ . What is the concentration of this new solution?
If 11.08 mL of 0.1111 M NaOH were required to neutralize 25.00 mL of a monoprotic acid, what was the concentration of the acid?
A spherical vessel (diameter $= 2.00 cm$ $"= 2.00 cm"$ ) when empty has a mass of $2.00 g$ $"2.00 g"$ . What is the greatest volume of water that can be placed in the vessel and still have the vessel float at the surface of the water?
Lag or my internet? [info on the new look of the impact map]
$40 %$ $40%$ of ${PCl}_{5}$ $"PCl"_5$ is not dissociated at $300^{\circ} C$ $300^@"C"$ . The reaction is carried out in a flask of $1-L$ $"1-L"$ capacity. The value of $K_{c}$ $K_c$ would be?
What was the first question to be asked on socratic?
What is the mole fraction of ${Na}_{2} {SO}_{4}$ $"Na"_2"SO"_4$ in a solution which is $11.5 %$ $11.5%$ by weight ${Na}_{2} {SO}_{4}$ $"Na"_2"SO"_4$ ?
The $K_{c}$ $K_c$ for the equation shown below is $0.543$ $0.543$ at $425^{\circ} C$ $425^@"C"$ . What is the value of $K_{c}$ $K_c$ for the reverse equation?
What is the pH of a solution made of 0.1 M acetic acid and 0.1 M potassium acetate to which 0.001 mol of KOH has been added?
What would be the final volume of a 10.4% (m/v) solution made from 5.00 g of solute?
What time does a new streak day start in Eastern Time Zone?
At $627^{\circ} C$ $627^@"C"$ and $1 atm$ $"1 atm"$ , ${SO}_{3}$ $"SO"_3$ is partially dissociated into ${SO}_{2}$ $"SO"_2"$ and $O_{2}$ $"O"_2$ . If the density of the equilibrium mixture is $0.925 g/L$ $"0.925 g/L"$ , what is the degree of dissociation?
The equilibrium constant for the reaction is $49$ $49$ . What is the equilibrium concentration of $HI$ $"HI"$ if $0.500$ $0.500$ mol $H_{2}$ $"H"_2$ and $0.500$ $0.500$ mol $I_{2}$ $"I"_2$ were mixed in a $1.00-L$ $"1.00-L"$ container initially?
Write the probable values of $l$ $l$ and $m_{l}$ $m_l$ for the principal quantum number $n = 3$ $n=3$ . Why?
What is the pH at the half equivalence point when 50.0 mL of 0.200 M NaOH is titrated with 0.100 M HCl? The starting pH is 13.3.
If $K_{p} = 2.4 \cdot 10^{- 3}$ $K_p = 2.4 * 10^(-3)$ for the reaction below, then what is $K_{c}$ $K_c$ ?
How do you convert from $kJ/g$ $"kJ/g"$ to $kJ/mol$ $"kJ/mol"$ ?
Does your karma get affected if a person likes your answer than unlikes it?
The $pH$ $"pH"$ at one-half the equivalence point in an acid-base titration was found to be $5.67$ $5.67$ . What is the value of $K_{a}$ $K_a$ for this unknown acid?
You have 2.5L of .14M salt solution, how many grams of salt would be needed to make this solution?
What is a key question?
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