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The pH of a solution is defined as -log10[H+]. Thus a solution with a hydrogen ion concentration of 10-5M has a pH of 5. [H+] = 10-5 pH = -log[H+] pH = - log [10-5] pH = 5
A substance with a pH of 5 is considered acidic. Examples include coffee, black tea, and beer.
A pH of 9 will give a pOH value of 5, as the sum of pH and pOH is always 14 in water at 25°C. This is because pH + pOH = 14 in water.
The pH can be calculated using the formula pH = -log[H+]. Given that the H+ concentration is 1.7x10^-5, the pH would be pH = -log(1.7x10^-5) ≈ 4.77. Thus, the pH of the solution is around 4.77.
Bromothymol blue is green at a pH of 5.