Give the pH for the following concentrations [H^+] a. [H^+] = 1.2 times 10^-4 b.

Question

Give the pH for the following concentrations [H^+] a. [H^+] = 1.2 times 10^-4 b. [OH^-] = 5.66 times 10^-7] Give the conjugate acid and the conjugate base for NH_3. Be sure to label them as a conjugate acid or base. Write balanced equations for the following reactions involving acids a. HCI + CaO rightarrow b. H_2 SO_4 + AI(OH)_3 rightarrow c. HCI + Na_2 CO_3 rightarrow Give the acid and base necessary to form the following salts and label them as acid, basic, or neutral salts. a. KBr b. NH_4 CI c. KF Determine the [H^+], [OH^-], and pOH, and for a solution having a pH = 12.34. A 5.00 niL aliquot of H2S04 is neutralized with 23.55 mL of a 0.1000 M NaOH solution. a. Write and balance the neutralization equation. b. Calculate the pH of the acid c. Calculate the % (w/v) of the acid. A buffer is made by adding equal molar portions of acetic acid (HC_2 H_3 O_2) and sodium acetate (NaC_2 H_3 O_2) to one liter of water. a. Write an equation showing how the buffer will remove H^+ from a solution after hydrochloric acid is added. b. Write and equation showing how the buffer will remove OH^- from a solution after sodium hydroxide is added.

Explanation / Answer

1) a) [H+] = 1.2*10-6
   PH = -log10[H+] = -log[1.2*10-6] = 5.92
b) [OH-] = 5.66*10-7 ; POH = -log[5.66*10-7] = 6.25
   PH + POH = 14 ; PH = 14-6.25 = 7.75
2) NH3 + H+ --------------> NH4+ (conjugate acid)
   NH3 -------------> NH2 (conjugate base) + H+
3) a) 2HCl + CaO ---------> CaCl2 + H2O
b) 3 H2SO4 + 2 Al(OH)3 --------------> Al2(SO4)3 + 6 H2O
c) 2 HCl + Na2CO3 -----------> 2NaCl + CO2 + H2O
4) a) KBr is formed from HBr(acid) and KOH (base), it is neutral salt
   b) NH4Cl is formed from NH4OH (base) and HCl (acid), acidic
   c) KF is formed from KOH(base) and HF (acid) , basic
5) PH = 12.34
PH = 12.34 = -log[H+]
[H+] = 10-12.34 = 4.57*10-13 M
POH = 14 -12.34 = 1.66
POH = -log[OH-] = 1.66

[OH-] = 10-1.66 = 0.0218 M
6)

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