Chemistry Practice Problems Strong Acid-Base Calculations Practice Problems Solution: Determine the pH of each solution.a solution that ...

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Solution: Determine the pH of each solution.a solution that is 1.07% HCl by mass (Assume a density of 1.01  g / mL for the solution.)

Problem

Determine the pH of each solution.

a solution that is 1.07% HCl by mass (Assume a density of 1.01  g / mL for the solution.)

Solution

We're asked to determine the pH of a solution that is 1.07% HCl by mass.


Recall that the pH of a solution is given by:


pH=-log H+

Take note that:         [H+] = [H3O+]


Since HCl is a strong acid, it will completely dissociate into ions in solution as follows:


HCl(aq)   H+(aq) + Cl(aq)


This means that:  [HCl] = [H+]

**Brackets, [] indicate concentration in molarity


We first need to determine the molarity of HCl.  


Recall that molarity (M) is given by:         

       

Molarity = mol soluteL solution


Since we’re given the mass percent (% by mass) and the density of HCl solution, we can find the number of moles of HCl and the volume of the solution


Recall that mass percent is given by:


mass percent =mass solutemass solution×100


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