Question

What volume in mL of 0.875 M NaCl(aq) should measure to make 225 mL of a 0.500 M NaCl (aq)?

Answer 1

Clearly, the desired concentration is less than the starting concentration. Thus, we would need to dilute the `0.875"M"` saline.

Hence, we need,

`0.225"L" * (0.500"mol")/"L" * "L"/(0.875"mol") approx 129"mL"` `0.875"M"` saline,

diluted with approximately `96"mL"` of distilled water to make the less concentrated saline.