Question

how much pure alcohol be added to 400 ml of a 15% solution to make its strength 32% with explanation​

Answer 1

Answer:

853.3ml (approx)

Step-by-step explanation:

If 15% solution contains 400ml alcohol.

Then 1% solution contain 400ml/15

So, 32% solution will contain 400/15*32=853.3ml

Therefore, the answer is 853.3ml (approx)

Answer 2

Hi mate,

Solution :

=> Volume of alcohol in 400 ml solution

➾ 0.15 × 400 ml

=> Volume of alcohol in 400 ml solution

➾ 60 ml

=> Volume of others liquid

➾ 340 ml

=> Let x ml of alcohol is added to make it 32% strong

=> Then, volume of alcohol

➾ 60+x ml

=> Volume of other liquid

➾ 340 ml

=> Volume of solution

➾ 400 + x ml

➾ 0.32 × (400 + x) = 60 + x

➾ 128 + 0.32x = 60 + x

➾ 0.68x = 68

➾ 68x = 6800

➾ x = 100 ml ...

Answer : 100 ml pure alcohol must be added to 400ml of a 15% solution to make it's strength 32%

i hope it helps you