Q82 of 90 Page 133

A chemist has one solution which is 50% acid and second which is 25% acid. How much of each should be mixed to form 10 liters of 40% of acid solutions?

Let 50% acidic solution be x litre and 25% acidic solution is y litre


Combine them to form 10 litre 40% acidic solution


Number of mole should be equal in both side so,




Multiplying by 100 from both the sides



And other condition is volume conservation


So, total volume of solution is 10 litre




Putting the value of x in equation (1)


50(10–y) + 25y = 400


500–50y + 25y = 400


25y = 100



y = 4


x = 6


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