1. Hydrogen cyanide (HCND is a very weak acid (K, 62 x 1010) when dissolved in w
ID: 591572 • Letter: 1
Question
1. Hydrogen cyanide (HCND is a very weak acid (K, 62 x 1010) when dissolved in water. It a 50 mL sample of 0.100 M HCN is titrated with 0.100 M NaOH, calculate the pH of the solution at the halfway point of the tration 2. Write an equation for the reaction of ammonium acetate (CH-COONHJ with water. What will be the pH of its aqueous solution? the grams of KHP (potassium hydrogen phthalate) needed to react with 25 2 mil of 0.10 M KOH ifthe reaction is 4 inte Haber process for the preparation of NH, which is given by the equlbin state the conditions of concentration and temperature that will favor the production of NH No @ zwep 23u - 5. how would you know a reaction is first-order or secondorder? Explain with diagrams following aqueous solutions in order of increasing freezing points: 0.30 moial NaCi 0.30 moialethanol, 0.30 molal BaCib, 0.10 molial CuSO and 0.10 molal glucose. 7. How would you separate Ag from Hg heding Cmmaia will separcate the hwo 8. How would you separate Cup. from BP ing Chlonde will epaiate the becquse you have to fihd at compand 9. How wpuld you separ 10. How would you separate Ag from AP- 1. How would you test Co in the presence of FeExplanation / Answer
1)
HCN is weak acid and NaOH is strong acid. At the half way point of the titration for weak acid and strong base, pH = pKa
pH = -log(6.2x10-10)
= -log 6.2 + 10
pH = 9.21
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