CAPE Chemistry Unit 2 · 2014 · Paper 1 · Question Q17

The concentration of an ammonia solution is determined by titrating 25.0\text{ cm}^3 against 0.2\text{ mol dm}^{-3} sulfuric acid to give an end point of 27.5\text{ cm}^3. The concentration of ammonia (in \text{mol dm}^{-3}) is given by

1. (A)\frac{0.2 \times 27.5}{25}
2. (B)\frac{0.2 \times 27.5}{2 \times 25}
3. (C)\frac{2 \times 0.2 \times 27.5}{25}
4. (D)\frac{2 \times 0.2 \times 25}{27.5}