To prepare a 10% solution of formalin, how much water should be added to 100 mL of stock formaldehyde?

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Multiple Choice

To prepare a 10% solution of formalin, how much water should be added to 100 mL of stock formaldehyde?

Explanation:
To make a 10% solution from a stock that is pure formaldehyde, you dilute by a factor of 10. Use C1V1 = C2V2. With C1 = 1.0 (100%), V1 = 100 mL, C2 = 0.10, solve for V2: V2 = (1.0 × 100) / 0.10 = 1000 mL. The water to add is V2 − V1 = 1000 − 100 = 900 mL. Therefore, add 900 mL of water.

To make a 10% solution from a stock that is pure formaldehyde, you dilute by a factor of 10. Use C1V1 = C2V2. With C1 = 1.0 (100%), V1 = 100 mL, C2 = 0.10, solve for V2: V2 = (1.0 × 100) / 0.10 = 1000 mL. The water to add is V2 − V1 = 1000 − 100 = 900 mL. Therefore, add 900 mL of water.

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