0.60 g of hydrogen chloride (HCl) is dissolved in water to make 6.5 L of solution. What is the pH of the resulting hydrochloric acid solution?
-log of h+
moles HCl = grams/molar mass.
M = moles/L soln.
2.49
To determine the pH of the hydrochloric acid (HCl) solution, we need to consider the concentration of HCl and its dissociation in water. The concentration of HCl can be calculated using the given mass of HCl and the volume of the solution.
First, we need to convert the mass of HCl from grams to moles. The molar mass of HCl is 36.46 g/mol.
Number of moles of HCl = mass of HCl / molar mass of HCl
= 0.60 g / 36.46 g/mol
= 0.01645 mol
Next, we calculate the concentration of HCl in the solution.
Concentration (molarity) = number of moles / volume of the solution
= 0.01645 mol / 6.5 L
= 0.00253 M
Now that we know the concentration of HCl, we can calculate the concentration of H+ ions in the solution. HCl is a strong acid and dissociates completely in water, so the concentration of H+ ions is the same as the concentration of HCl.
[H+] = 0.00253 M
Using the definition of pH, we can calculate the pH of the solution.
pH = - log [H+]
= - log (0.00253)
≈ 3.60
Therefore, the pH of the resulting hydrochloric acid solution is approximately 3.60.