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Q: How would you dilute a NaCl solution that has an initial concentration of 15% (w/v) to a 50 ml solution at 0.1%?

Ans: formula for dilution is S1V1 = S2V2
S1 (Strength of initial solution) = 15%
S2 (Strength of final solution) = 0.1%
V1 (Volume of initial solution) = Not known
V2 (Volume of final solution) = 50 ml
Calculation: After putting all the values in above equation-
15XV1=0.1X50
V1= (0.1X50)/15 = 5/15 = 0.33
0.33 ml of 15% NaCl solution should be mixed to 46.67 ml of distilled water to make a final volume of 50 ml....

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