1. Calculate the concentrations of the following:
(a) 0.100 mol of CuSO4 in 2000cm3 of solution
(b) 0.200 mol NaOH in 25cm3 of solution
(c) 8.50g of AgNO3 in 1000cm3 of solution
(d) 11.2g of Pb(NO3)2 in 50.0cm3 of solution
(e) 14.3g of K2Cr2O7 in 0.25dm3 of
solution
2. What is the concentration of a solution of calcium
hydroxide if 60.0cm3 of it is neutralised by 20.0 cm3 of
0.100M hydrochloric acid?
3.What volume of 0.500M sodium hydroxide is needed to neutralise 22.5cm3
of a solution of 0.262M sulphuric acid?
4. A 1.00g sample of limestone is allowed to react with 100cm3 of
0.200moldm-3 hydrochloric acid. The excess acid required 24.8cm3
of 0.100mol dm-3 sodium hydroxide solution. Calculate the
percentage of calcium carbonate in the limestone.
5. A solution of sodium carbonate Na2CO3, contains 53.0g
in 250cm3 of solution. Calculate the volume of aqueous
hydrochloric acid of concentration 0.25 moldm-3 needed to neutralise
25.0cm3 of the sodium carbonate solution.
Answers:
1a. 0.050 moldm-3, (b) 8 moldm-3, (c) 0.500 moldm-3
(d) 0.676 moldm-3 (e) 0.194 moldm-3
2. 0.0167 moldm-3 3. 23.6cm3 4. 87.3% 5. 400cm3.