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.

Question

Mathematics

Libby

2 February, 06:54

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.

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Declan Olsen · Answer 1

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.