If i add 25 ml of water to 135 ml of a 0.25 m naoh solution what will the molarity of the diluted solution be

0.21 M. (2 sig. fig.)

Explanation:

The molarity of a solution is the number of moles of the solute in each liter of the solution. The unit for molarity is M. One M equals to one mole per liter.

How many moles of NaOH in the original solution?

,

where

.

What's the concentration of the diluted solution?

.

Concentration of the diluted solution:

.

The least significant number in the question comes with 2 sig. fig. Keep more sig. fig. than that in calculations but round the final result to 2 sig. fig. Hence the result: 0.021 M.

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