Answer :
The pH of the solution is 0.65.
To find the pH of the solution, we need to first calculate the concentration of HCl in moles per liter (Molarity).
Molarity (M) = moles of solute/volume of solution (in liters)
In this case, we have 1.57 moles of HCl dissolved in 7.00 L of water:
Molarity (HCl) = 1.57 moles / 7.00 L = 0.224 M
The pH of a solution can be calculated using the equation:
pH = -log[H+]
Since HCl is a strong acid, it completely dissociates in water, and the concentration of H+ ions is equal to the concentration of HCl.
Therefore, the pH of the solution can be calculated as:
pH = -log(0.224) = 0.650
Rounding the answer to the correct number of significant figures, the pH of the solution is 0.65.
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