How to calculate molar concentration of phenol red?

timer Asked: Mar 2nd, 2016

Question description

How to calculate molar concentration of phenol red when mixed with water and a buffer?

The concentration of phenol red is 1E-4 M. The initial volume used was .1 mL and is then mixed with .9 mL of water and 4.0 mL of a .1M borate buffer of pH 9.8.

I used a simple M1V1 = M2V2. Where M1 = 1E-4M and V1 is .1mL and V2 is 5.0 mL and I solved for M2.

I don t think this is correct though how does the concentration of the buffer play in the new concentration of phenol red in this circumstance?

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