Answer to Question #162147 in General Chemistry for Rose

Question

A 100.00 cm³ sample of natural water required 41.00 cm³ of 0.200 M hydrochloric acid for neutralization with screened methyl orange as indicator and 2.00 cm³ of the same acid with phenolphthalein as indicator. Calculate the HCO₃^- and CO₃^2- content of the water in mg dm-3

Answer 1

An acid-base titration is used to determine the unknown concentration of an acid or base by neutralizing it with an acid or base of known concentration. Using the stoichiometry of the reaction, the unknown concentration can be determined. It makes use of the neutralization reaction that occurs between acids and bases and the knowledge of how acids and bases will react if their formulas are known.