Answer Posted / greg

Convert % to ppm. This is probably faster.

Ammonia Solution
1% = 10000ppm
25% = 250000 (25/100 = 0.25 X 1000000)


C1V1 = C2V2
C1 = 50 ppm (target solution concentration)
V1 = 100 mL (targer solution volume)

C2 = 250000 ppm (stock solution concentration)
V2 = X (stock solution volume required)

V2 = 0.02 mL diluted to 100mL in a volumetric flask

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