1,950 ml of water should be added to 780 ml of sodium chloride to maintain the ratio of 2:5 Given: Ratio of sodium chloride to water 2:5 sodium chloride = 780 ml water = ? proportionality a:b = c:d where ad = bc a = 2 ; b = 5 ; c = 780 ml ; d = x 2:5 = 780:x 2x = 780*5 2x = 3900 x = 3900/2 x = 1950 ml of water.
You are working as a clinical chemist in charge of the testing of blood samples. You are required to mix a solution of sodium chloride with water in the ratio of 2:5. Starting with 780ml of the sodium chloride solution, how much water needs to be added? Give your answer in standard form to an appropriate number of significant figures.