# Titrations

More titrations [Higher]

Aim

To gain further practice in solving titration problems.

Fairly straightforward

1. What volume of 0.2 M ammonia solution, NH4OH, would be neutralised by 25 cm3 of 0.3 M nitric acid, HNO3?
2. 25 cm3 of sulfuric acid, H2SO4, neutralised 18.4 cm3 of 0.4 M potassium hydroxide, KOH. What was the concentration of the acid?
3. What volume of 0.1 M hydrochloric acid, HCl, would neutralise 17.5 cm3 of 0.2 M barium hydroxide, Ba(OH)2?
4. 25 cm3 of phosphoric acid, H3PO4, neutralised 42.6 cm3 of 0.2 M sodium hydroxide, NaOH. What was the concentration of the acid?
5. What volume of 0.4 M ethanoic acid, CH3CO2H, would neutralise 17.6 cm3 of 0.3 M sodium hydroxide?

Challenge

6. 4.0 g of sodium hydroxide, NaOH, is dissolved in water and the solution diluted to 1 dm3. What volume of this solution would neutralise 25 cm3 of 0.1 M sulphuric acid, H2SO4?
7. 2.0 g of pure undiluted H2SO4 is cautiously added to water and the solution diluted to 500 cm3. What volume of 0.1 M potassium hydroxide, KOH, would exactly neutralise 25 cm3 of the acid solution?
8. What mass of copper oxide, CuO, would dissolve in 200 cm3 of 2.0 M sulfuric acid? What mass of copper sulphate crystals, CuSO4.5H2O could then be obtained by letting the solution crystallise?
9. 1.67 g of an alkali, formula QOH, was dissolved in water and the solution diluted to 500 cm3.
25 cm3 of this solution exactly neutralised 35 cm3 of 0.1 M HCl. If you know that Q is an element in Group 1 of the periodic table, identify Q.
10. Tm is a transition metal that forms an oxide of formula TmO. 10.7 g of TmO dissolved in 200 cm3 of 1.0 M sulfuric acid, forming a pink solution and neutralising some but not all of the acid. The remaining acid was titrated with 1.0 M sodium hydroxide when 114.4 cm3 was required for complete neutralisation. Use this information to identify the transition metal Tm.
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Atomic weights H = 1 Li = 7 O = 16
Na = 23 S = 32 Co...