Respuesta :
The pH of the resulting solution formed by mixing HCl in water is 2.40.
Since pH is essentially a measurement of the concentration of hydrogen ions (i.e., protons) in a substance, the letters pH stand for potential of hydrogen. A solution's pH is a significant indicator of its chemical composition. The pH can affect how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.
The pH of any solution will be calculated as pH = -log[H⁺], where [H⁺] is the concentration of H⁺ ions. HCl is a strong acid and its shows full dissociation, so the concentration of H⁺ ions is equal to the concentration of HCl
Given mass of HCl = 0.45 g
Volume of solution = 2.0 L
We calculate the concentration of H⁺ ions as below:
M = n/V, where
V = volume
n = no. of moles
And no. of moles will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Moles of 0.45 g of HCl = 0.45 g / 36.5g/mol = 0.0123mol
Now we put all these values in the above equation of concentration as:
M = 0.0123mol / 2.0L = 0.0061 M
We will put these values of concentration of H⁺ ions in the pH equation as:
pH = -log(0.006) = 2.22
Hence, 2.22 is the value of pH.
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