please help with these 3 questions Show by a balanced equation how each of the f

Question

please help with these 3 questions

Show by a balanced equation how each of the following salts, if any, is hydrolyzed by water, then tell which salt would give an acidic, basic, or neutral solution:

                            (i) Na2CO3     (ii) Al(NO3)3    (iv) HCOONa

5. Calculate the pH of a buffer solution prepared by mixing 20.0 mL of 0.20 M acetic acid with 10.0 mL of sodium acetate. Ka for acetic acid = 1.8 x 10-5

6. Calculate the pH of a buffer solution prepared by mixing 20.0 mL of 0.20 M in ammonia and

15. 0 mL of 0.30 M in ammonium chloride? Assume the total volume is 35.0 mL. Kb for ammonia is 1.8 x 10-5.

Explanation / Answer

4)

a) Na2CO3 + 2H2O ----------------> 2 NaOH + H2CO3

this salt is basic

b) Al (NO3)3 + 3 H2O ---------------> Al(OH)3 + 3HNO3

it is acidic salt

c) HCOONa + H2O -------------------> HCOOH + NaOH

it is basic salt

5) you missed to give molarity of sodium acetate

6)

pKb = -log Kb = 4.74

pOH = pKb + log [NH4Cl / NH3]

pOH = 4.74 + log (20 x 0.2 / 15 x 0.3)

pOH = 4.69

pH + pOH = 14

pH = 9.31

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