CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A laboratory stock bottle contains 0.500MHNO3. A technician needs 2.00L of an acidic rinse solution having pH = 2.60.
Assume 25∘C throughout and that HNO3 dissociates completely in water.
(a) Show, with calculations, whether the stock solution must be diluted or concentrated to reach the target pH.
(b) Determine the exact volume of the 0.500M stock solution the technician should deliver into a 2.00L volumetric flask before diluting to the mark with distilled water.
(c) After preparing the solution, the technician measures its temperature and discovers it has warmed to 28∘C. Discuss qualitatively how (or if) this small temperature increase would alter the pH, citing relevant chemical principles.