An experimental procedure requires 10 ml of acid to be dissolved into a beaker of water. An additional 5 ml of acid is added to the solution. Which statement best describes the new solution?

Adding 5 ml of acid to the solution increases the amount of acid from 10 ml to 15 ml while the amount of water stays the same. That makes the acid concentration higher. The acid’s strength is an intrinsic property, so adding more of it does not increase its strength.

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