A Chemist Needs 500 ML of a 20 MM Phosphate

question 73

Multiple Choice

A chemist needs 500 mL of a 20 mM phosphate buffer.The stock solution of the buffer is 100 mM.How much stock solution should be used to make the 20 mM phosphate buffer?

• A) 100 mL
• B) 1000 mL
• C) 10 mL
• D) 1.0 mL
• E) 0.1 mL

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