Question

write the formulas of the four acids in order of decreasing strength based on the rates...

write the formulas of the four acids in order of decreasing strength based on the rates at which they displace hydrogen when reacting with zinc. Record the pH below each formula. Acetic acid hydrochloric acid phosphoric acid sulfuric acid

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Answer #1

Formulas:

Acetic acid = CH3COOH

hydrochloric acid = HCl

phosphoric acid = H3PO4

sulfuric acid = H2SO4

increasing strength:

HCl --> strongest, due to halide ioinzation H+ and Cl- pKa = -7

H2SO4 --> second storngest, due to SO4-2 poalrity will donate first H+ readily. pKa1 = -3 and pKa2 = 1.67

H3PO4 --> third storngest --> H3PO4 will ionizae into pKa1,2,3 = 2.1 / 7.2 / 12.3

finally

Aceetic acid, a molecular acid --> CH3COOH into CH3COO- has pKa = 4.75

Expect pH depends mostly on concentration but for a dilute solution expect pH <pKa overall

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