Question

a solution is made by combining 5 mL of .2M HC2H3O2, 5 mL of .2M NaC2H3O2, and 10 ml of water. calculate the molarity of HC2H3O2 and of NaC2H3O2 in this new solution
You have diluted the HC2H3O2 solution and 5 mL of the NaC2H3O2 solution to 20 mL; therefore, the new concns are
0.2M x (5/20) = ??

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