SOLUTION: 10 ml of 100% pure acid is added to 60 ml of 70% acid solution what percent concentration will the resulting solution have?

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Question 967164: 10 ml of 100% pure acid is added to 60 ml of 70% acid solution what percent concentration will the resulting solution have?
Answer by ikleyn(52787) About Me  (Show Source):
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Notice that all concentrations in this problem are Volume-to-Volume concentrations.

60 ml  of  70%-solution contains  70%2F100.60 = 0.7%2A60 = 42 ml  of pure acid.

After adding of  10 ml  of the pure acid the total solution volume will be  70 ml,  and the total volume of the pure acid will be  42 ml + 10 ml = 52 ml.

Hence,  the concentration of the obtained solution will be  52%2F70 = 0.743 = 74.3% (approximately).

Answer.  The concentration of the obtained solution will be  74.3% (approximately).