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2 years ago

To reduce 16 ounces of a 25% solution of antiseptic to a 10% solution, how much distilled water should a nurse add?

2 answers:

8 0

Let x = amt of distilled water
:
A simple equation
.25(16) = .10(x+16)
4 = .10x + 1.6

4 - 1.6 = .1x
2.4 = .1x
x = 2.4/0.1
x = 24 oz of distilled water
:
:
Prove this by seeing the amt of antiseptic is the same (only the % changes)
.25(16) = .10(24+16)
4 = .1(40)

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Fittoniya [83]2 years ago

8 0

Answer: 24 oz

Explanation:

According to concentration equation:

$C_1V_1=C_2V_2$

where $C_1$ = concentration of ist solution

$V_1$ = Volume of ist solution

$C_2$ = concentration of 2nd solution

$V_2$ = volume of 2nd solution

$25\%16oz=10\%V_2$

$V_2=40oz$

Thus to make the volume of 16oz to 40oz, she must add (40-16)oz=24 oz

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