Question

How many liters of 90% concentrated acid needs to be mixed with 75% concentrated acid to get a 30 liter solution of 78% concentrated acid?

Answer 1

Answer:

Explanation:

• Let the required volume of 90 % solution=x.
• The required volume of 75%solution=(30-x).
• The final solution has a concentration of 78% with volume 30 liters.
• Now forming Equation
• 90x +(30-x)75= 78X30.
• Upon solving the above equation we get, x=6.
• So on mixing 6 liters of 90% concentrated acid with 24 liters of 75% concentrated acid we can get 30 liters of 78 % concentrated acid.

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OR

Let V litre of 90% of conc acid is required to mix

Now to get 30 litre of 78% of conc acid solution we have total volume of soln = 30 litre

(30- v) litre of 75% of another conc acid to be mixed

Now according to the formula

N1V + N2(30- V) = N×30

90× V + 75× (30- v) = 78×30

V = 6 litre