A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by
The correct answer is D. adding sodium carbonate
its D because when sodium carbonate reacts with calcium hydrogentrioxocarbonate it gives sodium hydrogentrioxocarbonate and calcium trioxocarbonate. However, when it react with calcium sulphate, calcium carbonate and sodium tetraoxosulphate is formed
Previous question Next questionWhat is Exam without Practice? With our customizable CBT practice tests, you’ll be well-prepared and ready to excel in your examsStart Practicing Now
