### Dilution Problem - Find Final Concentration

9. Altering Product Strength 9.1) Dilution 9.1.1) Dilution

9.1.1.1) Find initial concentration in dilution Easy 1

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34 mL of a 25.75 % solution is diluted to make the final volume of 129.5 mL. Calculate the new concentration.

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lb equals 6.76 % kg

This is a volume expansion or concentration dilution type problem. The essential formula is Q_1C_1 = Q_2C_2.
Here,

Q_1 = initial quantity = 34\quadmL.
C_1 = initial concentration = 25.75\quad%
Q_2 = final quantity = 129.5\quad mL.
C_2 = final concentration = ?\quad %

Therefore, rearranging the formula, we get:
C_2 = (Q_1 × C_1)/(Q_2)

therefore C_2 = (34 × 25.75) /129.5=6.76\quad % (Ans.).

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