How can i prepare a standard solution of Nacl?

Question

How can i prepare a standard solution of Nacl?

Answer 1

A standard solution of any substance merely means a specific concentration of that particular chemical. This is so that concentrations can be standardised around the world. Normally the specific concentration of salt would also be stated. You do not say what concentration of sodium chloride you seek, but here are a few examples:

(1) To make a 1 mole solution of NaCl you need to get the weight of salt right. This is done by looking at the atomic weights of all the elements which make it up. In this case, each molecule of salt has one atom of Sodium and one of Chlorine, and the atomic weight of 1 atom of Sodium is 22.990 and 1 atom of Chlorine is 35.453. So if you add the two you get 58.443 -and that is the important number.

You simply take 58.443g of dried salt and dissolve it into exactly 1 litre of distilled water, and that is a standard solution of NaCl with a molarity of 1 (ie 1 mole per litre), written as 1M. It is also called 'Normal' or 1N.

(2) If you only added half the above amount of salt to the litre of water, it would be a 0.5M or 0.5N solution.

(3) Or if you  only added half a litre of water to the 58.443g it would be twice as concentrated at 2M or 2N.

But remember -they would all still be classed as 'standard' solutions of salt!