required practical: water purification.

Question 1

what are the basic steps to do this practical?

Answer 1

1- salt water in conical flask, set up apparatus for distillation. place a mixture of ice and water around tube
2- heat water with flame until it boils. reduce heat. collect 1cm of water in tube, stop heating
3- flame test and nitric acid, silver nitrate test

Question 2

what does a yellow flame suggest and in this practical where would this be evident?

Answer 2

sodium is present. salt water.

Question 3

what does a white précipité suggest within a nitric acid and silver nitrate test and where would it be evident?

Answer 3

chloride ions present. salt water.

Question 4

how do you know if you’ve got pure water?

Answer 4

see if it boils at 100 degrees.