Question

B Choose the answer that best completes each sentence. A oxalate ion silver halide To detect the presence of carbonates and calcium bicarbonates can be added, which results to ciodine; no reaction A qualitative test for halides is the addition of resulting in a silver ion; insoluble calcium oxalate To detect the presence of calcium in a sample, is added Nitric acid, evolution of carbon dioxide gas which results to the formation of oxalate ion; insoluble calcium oxalate G. silver ion, silver halide precipitate The most common cation present in "natural" waters is magnesium oxalate ion; formation of carbon dioxide F H. 1

Answer 1

1. E

2. G

3. F

4. B (The most common cation present in natural water is Calcium, however Magnesium is also very common.)