How to calculate rate of dissolution?
The problem states, 'A student wants to determine how long it takes to dissolve 51.3 g of common table salt (sodium chloride) in 1L of water by monitoring the solution. It takes 26.7 seconds for the salt to completely dissolve. Determine the rate of dissolution.'
I'm afraid I just don't know where to start with this. Do I just divide the mass by the time to get a rate in grams per second?
Thanks!
The problem states, 'A student wants to determine how long it takes to dissolve 51.3 g of common table salt (sodium chloride) in 1L of water by monitoring the solution. It takes 26.7 seconds for the salt to completely dissolve. Determine the rate of dissolution.'
I'm afraid I just don't know where to start with this. Do I just divide the mass by the time to get a rate in grams per second?
Thanks!
1 Answer
You can calculate an average rate of dissolution... I'm guessing it is supposed to be in
#"51.3 g NaCl" xx "1 mol"/"58.442 g NaCl" = "0.8778 mols NaCl"#
And since we have
#color(blue)("rate"("avg")) = ("0.8778 mols NaCl"/"1 L soln")/("26.7 s") = color(blue)("0.0329 M/s")#
So, ON AVERAGE,
(This would be the instantaneous rate of dissolution after around