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What is the pH of the resulting solution made by mixing 25 mL of 0.1 M HCl and 15 mL of 0.1 M NaOH?
Solution:
The given word problem is about the mixing of an acid and a base. If you mix an acid and a base, their products are salt and water. The chemical reaction for the given mixture is written as follows
In order to convert the HCl and NaOH completely into NaCl and water, you must have equal moles at each reactants which are HCl and NaOH. Let's see if the two reactants will be used completely as follows
Since the number of moles of HCl is greater than the number of moles of NaOH, then the resulting solution is an acid.
Hence, the molarity of the resulting solution which is HCl is
Therefore, the pH of the resulting solution which is HCl solution is
