+3 points SPreCalc7 4.7.001 My Notes Ask Your Teacher The hydrogen ion concentra

Question

+3 points SPreCalc7 4.7.001 My Notes Ask Your Teacher The hydrogen ion concentration of a sample of each substance is given. Calculate the pH of the substance. (Round your answers to one decimal place.) (a) Oranges : [H+] = 2.5 x 10-4 M (b) Tomato Juice : [H+]- 3.2 x 10-4 M (c) Seawater: [H+]- 5.0 × 10-9 M Need Help? Read It Watch 4 points SPreCalc7 4.7.003.MI. The pH reading of a sample of each substance is given. Calculate the hydrogen ion concentration of the substance. (Give your answers in scientific notation, correct to one decimal place.) My Notes Ask Your Teacher (a) Vinegar: pH 3 [H+] = (b) Crackers: pH7.2 Need Help?ReadItWatch tMaster It

Explanation / Answer

We know that
pH = -log(H+)

a)
-log(2.5 * 10^-4)

3.6

b)
-log(3.2 * 10^-4)

3.5

c)
-log(5 * 10^-9)

8.3

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pH = 3
pH = -log(H+)

So, log(H+) = -pH

H+ = 10^(-pH)

So, 10^-3

1 * 10^-3 ----> FIRST ANS
-----------------------------------------------

7.2 :

10^-7.2

1 * 10^-7.2

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