This exercise deals with logarithmic scales. The hydrogen ion concentration of a

Question

This exercise deals with logarithmic scales. 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.) Oranges: [H^+] = 2.5 times 10^-4 M _________ Apples: [H^+] = 1.3 times 10^-4 M ________ Hominy (lye): [H^+) = 3.9 times 10^-13 M ________ Find all solutions of the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan^2 theta -1 = 0 theta = ________

Explanation / Answer

13)

a)oranges : [H+]=2.5*10-4 M

pH= -log10[H+]

pH= -log10[2.5*10-4]

pH= -log10[2.5]-log10[10-4]

pH= -log10[2.5]-(-4)log1010

pH= -log10[2.5] +4

pH=4 -log102.5

pH=3.6

b)apples : [H+]=1.3*10-4 M

pH= -log10[H+]

pH= -log10[1.3*10-4]

pH= -log10[1.3]-log10[10-4]

pH= -log10[1.3]-(-4)log1010

pH= -log10[1.3] +4

pH=4 -log101.3

pH=3.9

c)hominy : [H+]=3.9*10-13 M

pH= -log10[H+]

pH= -log10[3.9*10-13]

pH= -log10[3.9]-log10[10-13]

pH= -log10[3.9]-(-13)log1010

pH= -log10[3.9] +13

pH=13 -log103.9

pH=12.4

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14)tan2 -1=0

tan2=1

tan=-1, tan=1

=1.57k -0.79 rad

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