Question

A 5% Dextrose solution is diluted with sterile water. The volume of the sterile water added is 40% of the volume of the Dextrose. What is approximately the new Dextrose concentration?

Answer 1

Answer:

4.90% is approximately the new Dextrose concentration.

Explanation:

Volume by Volume percent is given by ;

$(v/v)\%=\frac{\text{Volume of solute}}{\text{Volume of solution}}\times 100$

Volume percentage of dextrose solution = 5%

In 100 mL of solution 5 ml of dextrose is present.

Now, volume sterile water added was equal to the 40% of volume of dextrose volume.

So, volume of the sterile water added = $\frac{40}{100}\times 5 ml = 2 mL$

Total volume of the solution after addition of water = 100 mL + 1 mL = 102 mL

New concentration of dextrose will be;

$(v/v)\%=\frac{\text{Volume of solute}}{\text{Volume of solution}}\times 100$

$\frac{5 mL}{102 mL}\times 100=4.90\%$

4.90% is approximately the new Dextrose concentration.