Question

Определить рН в 0,07 M HCl

Answer 1

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Answer 2

pH (potential of hydrogen) is a measure of the acidity or alkalinity of a solution. It is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in a solution. In order to determine the pH of a solution, we need to know the concentration of H+ ions.

In the case of a 0.07 M (molar) solution of hydrochloric acid (HCl), we can determine the pH using the following steps:

Step 1: Write the balanced chemical equation for the dissociation of HCl in water: HCl → H+ + Cl-

Step 2: Determine the concentration of H+ ions in the solution. Since HCl dissociates completely in water, the concentration of H+ ions is equal to the concentration of the HCl solution. In this case, it is 0.07 M.

Step 3: Calculate the pH using the formula: pH = -log[H+]

Substituting the concentration of H+ ions into the formula, we get: pH = -log(0.07)

Step 4: Use a calculator to evaluate the logarithm: pH ≈ -(-1.15490196) ≈ 1.15

Therefore, the pH of a 0.07 M HCl solution is approximately 1.15.

It's important to note that pH is a logarithmic scale, which means that each whole number change in pH represents a tenfold change in acidity or alkalinity. Hence, a solution with a pH of 1 is ten times more acidic than a solution with a pH of 2, and a solution with a pH of 1 is one hundred times more acidic than a solution with a pH of 3.

I hope this explanation helps! Let me know if you have any further questions.