Question

A clinical laboratory technician needs to prepare reagent for a spectrophotometry.He has on his working bench analytical balance, glassware, cobalt chloride salt, deionized water and 32% HCl solution.He needs 500mL of 1% HCl working solution.

i.How can 500mL of 1% HCl be made using 32% HCl solution and deionized water?

Answer 1

1/32 the concentration, so you need 32 times the volume.

So add water to 500/32 = 15.625 mL of the 32% acid, to get 500 mL