(a) Calculate the pH of the 0.30 M NH3 / 0.35 M NH4Cl buffer.   What is the pH of the buffer after the addition of 0.030 mol HCl?   note: Ka  (NH4+) = 5.6 x 10 -10   NH3 (aq) + H+ (aq) → NH4+ (aq)   (b) What are the hydronium [H3O+] and hydroxide [OH-] ion concentrations at 25°C in a 4.0 M aqueous Mg(OH)2.

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(a) Calculate the pH of the 0.30 M NH/ 0.35 M NH4Cl buffer.
 
What is the pH of the buffer after the addition of 0.030 mol HCl?
 
note: Ka  (NH4+) = 5.6 x 10 -10
 
NH(aq) + H(aq) → NH4(aq)
 
(b) What are the hydronium [H3O+] and hydroxide [OH-] ion concentrations at 25°C in a 4.0 aqueous Mg(OH)2.
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