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Determining pH of Weak Acid-Strong Base Reaction in Flask

Calculate pH in a 1.0L flask with 5 moles weak acid (HA) and 2 moles strong base (OH-), given Ka=1.0x10-6. Follow reaction steps for equilibrium and find pH.

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Determining pH of Weak Acid-Strong Base Reaction in Flask

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  1. Suppose 5 moles of a weak acid (HA) were mixed with 2 moles of a strong base (OH-) in a 1.0 L flask. Given the Ka = 1.0 x 10-6, determine the pH. CHEMISTRY: 1st HA + OH-→ H2O + A- + xsHA Initial 5 2 0 ? Change -2 -2 +2 After RXN 3 0 2 3 xsHA Now for Equilibrium: xsHA + H2O  H3O+ + A- I.3 0 2 C. -x +x +x E. 3-x x 2+x try dropping both the +x and the –x terrms x = 1.5 x10-6 = [H3O+] pH = -log [H3O+] = 5.82

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