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What is distilled water?

You have 200 ml of a 4 M NaCl stock solution. What volumes of stock and distilled water must you add together to create 8 ml of a 250 mM wor?

  • A 7.5 ml of stock and 0.5 ml of distilled water B 0.5 ml of stock and 7.5 ml of distilled water C 0.125 ml of stock and 7.875 ml of distilled water D 2 ml of stock and 6 ml of ...show more

  • Answer:

    B 0.5 ml of stock and 7.5 ml of distilled water = Answer. = a 16 fold dilution 4M to 250mM = 16 fold dilution. D is only a 4 fold dilution.

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Answer is C. 0.125ml stock and 7.875ml distilled water.

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(x ml)(4 M) = (8 ml)(0.25 M) x = 0.5 ml So, you need 0.5 mls of the 4 M stock and 7.5 mls distilled water to get 8 mls 0.25 (250 mM) NaCl. Answer is B

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