Analía Bellizzi – Chemistry Classes

Ronald Reagan Senior High School

Reacting Masses and Volumes – Titrations

AS Masses and volumes – Titrations exercises

1. 25.0 cm3 of a solution of 0.1 moldm-3 NaOH reacts with 50.0 cm3 of a solution of hydrochloric acid. What is the molarity of the acid?
2. 25.0 cm3 of a 0.100 moldm-3 solution of sodium hydroxide was titrated against a solution of hydrochloric acid of unknown concentration. 27.3 cm3 of the acid was required. What was the concentration of the acid?
3.  25.0 cm3 of a solution of NaCl reacts with 15.0 cm3 of 0.0200 moldm-3 solution of AgNO3. What is the molar concentration of the NaCl solution?
4. 25.0 cm3 of a 0.100 moldm-3 solution of an acid HxA reacts with 75.0 cm3 of a 0.100 moldm-3  solution of NaOH. What is the value of X?

HxA + xNaOH → NaxA + XH2O

1.  A solution of hydrochloric acid of volume 25.0 cm3 was pipetted onto a piece of marble which is calcium carbonate. When all action had ceased, 1.30 g of the marble had dissolved. Find the concentration of the acid.

CaCO3 + 2HCl → CaCl2 + CO2 + H2O

1.  What volumen of 0.100 moldm-3 hydrochloric acid would be required to dissolve 2.30 g of Calcium carbonate?

CaCO3 + 2HCl → CaCl2 + CO2 + H2O

1.  2.05 g of the carbonate of an unknown alkali metal (X2CO3) required 8.90 cm3 of 2.00 moldm-3 hydrochloric acid. To completely dissolve it. What was the relative atomic mass of the metal and which metal was it?
2. 3.20 g of hydrated sodium carbonate, Na2CO3•XH2O, was dissolved in water and the resulting solution was titrated against 1.00 moldm-3 hydrochloric acid. 22.4 cm3 of the acid was required. What is the value of X?