The acidity of a solution is measured by its pH, which is given by the formula p

Question

The acidity of a solution is measured by its pH, which is given by the formula pH = -log (H^+) where H^+ measures the concentration of hydrogen ions in moles per liter.+ The pH of pure water is 7. A solution is referred to as addle if its pH is below 7 and as basic if its pH is above 7. Calculate the pH of each of the following substances. (Round your answers to the nearest tenth.) Blood: 3.9 times l0^-8 moles/liter pH = Milk: 4.0 times 10^-7 moles/liter pH = Soap solution: l.1 times 10^-11 moles/liter pH = Black coffee: 1.3 times l0^-7 moles/liter pH = How many moles of hydrogen ions are contained in a liter of acid rain that has a pH of 5.0? moles Complete the following sentence: If the pH of a solution increases by 1.0, then the concentration of hydrogen ion to of the original amount.

Explanation / Answer

a) for blood H+ = 3.9x10^-8

so pH = - log(H+) = -log(3.9x10^-8) = 7.409

for milk H+ = 4 x 10^-7

so ph = -log (H+) = 6.398

for soap solution = H+ = 1.1x 10^-11

so pH = -log(H+) = 10.96

black coeffie H+ = 1.3x10^-7

so pH = -log(H+) = 6.886

b) given pH = 5

5 = -log(H+) => H+ = 10^-5

10^-5 moles present in one liter of acid rain

c) to increase the pH by one we need to decrease the H+ concentration by 1/10 times

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