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A chemist used 30ml of a concentrated solution of

ammonium chloride to prepare a 2.5L of a 0.030M diluted solution.

what was the concentration of the original solution of ammonium

chloride?

Answer :

The concentration of the original solution of ammonium chloride can be calculated using molarity formula. After determining the moles of ammonium chloride in the diluted solution, we find that the original concentration is 2.5 M (mol/L).

In order to determine the concentration of the original solution of ammonium chloride, we need to use the formula of molarity (M) which is M = moles/volume. Firstly, we can calculate the moles of the chemical in the diluted solution. Since M = moles/volume, rearrange it to moles = M*volume, then we can get the moles = 0.030 M * 2.5L = 0.075 moles. As the amount of a substance stays the same before and after dilution, we can then find the original concentration by inserting this amount and the original amount of solution, which is 30ml or 0.030L.

Therefore, the original concentration = moles/original volume = 0.075 moles/0.030 L = 2.5 M (or 2.5 mol/L).

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