Question

. H ow many milliliters of water must be added to 250 mL of a 25% w/v stock solu- tion of sodium chloride to prepare a 0.9% w/v sodium chloride solution

Answer 1

The right answer would be

Answer 2

We have that for the Question  it can be said that the volume of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution is

x=444ml

From the question we are told

. H ow many milliliters of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution

Generally the equation for the volume of NaCl   is mathematically given as

$V=\frac{25}{100}*250\\\\V=62.5ml$

Therefore

$\frac{62.5}{250+x}*100=0.9\\\\x=6250-2250\\\\x=4000ml\\\\x=444ml$

Therefore

the volume of water must be added to 250 mL of a 25% w/v stock solu- tion of sodium chloride to prepare a 0.9% w/v sodium chloride solution is

x=444ml

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