How much of a stock solution of 10.0 mg/L phosphate standard, do you need to use to make a final solution containing a volume of 16 mL and 6.5 mg/L phosphate?

Answer 1

You can use V1C1 = V2C2

(x L)(10.0 mg/L) = (0.016 L)(6.5 mg/L)

x = 0.0104 L = 10.4 ml