San excellent goodmacheer Kalvi 1dosth Biochemistry Ionic Harmony Several Most Issues

San excellent goodmacheer Kalvi 1dosth Biochemistry Ionic Harmony Several Most Issues

Question 6. 1M CHstep step step threeCOOH solution. The dissociation constant of acetic acid is 1.8 x 10 -5 . Answer: pH = – log[H + ] For weak acids,

Question 7. Find the pH of a buffer solution containing 0.20 mole per litre sodium acetate and 0.18 mole per litre acetic acid. Ka for acetic acid is 1.8 x 10 -5

Given that Ka = 1.8 x 10 -5 pKa = – log (1.8 x 10 -5 ) = 5 – log 1.8 = 5 – 0.26 = cuatro.74 pH = 4.74 + log \(\frac < 0.20>< 0.18>\) = 4.74 + log \(\frac < 10>< 9>\) = 4.74 + log 10 – log 9 = 4.74 + 1 – 0.95 = 5.74 – 0.95 = 4.79

Concern 8. What is the pH regarding an enthusiastic aqueous service gotten from the collection 6 gram away from acetic acidic and you will 8.2 gram away from sodium acetate and putting some volume comparable to five hundred ml. (Given: K to have acetic acidic was 8 x 10) Answer: Predicated on Henderson – Hessalbalch formula,

  • the fresh new hydrolysis constant,
  • level of hydrolysis and you will
  • pH of O.1 M CH3COONa solution (pKa for CH3COOH is 4.74).

3COONa is a salt of weak acid (CH3COOH) and a strong base (NaOH). Hence, the solutions is alkaline due to hydrolysis. CH3COO (aq) + H2O (aq) \(\rightleftharpoons\) CH3COOH (aq) + OH – (aq) Give that pKa = 4.74 pKa = – log Ka i.e., Ka = antilog of ( – PKa) = antilog of ( – 4.74) = antilog of( – 5 + 0.26) 10 -5 x 1.8

  1. BaSO4
  2. Ag2(CrO4)

Determine the fresh new pH from 0

Question 1. Which one of the following buffer is present in blood (a) CH3COOH + CH3COONa (b) NH4OH + NH4Cl (c) H2CO3 + NaHCO3 (d) HCI + NaCl Answer: (c) H2CO3 + NaHCO3

Concern 2. And therefore of following is generally found in the fresh new manure globe? (a) Lactic acid (b) Sulphuric acid (c) Tannic acid (d) Carbonic acid Respond to: (b) Sulphuric acid

Answer: CH

Question 3. Which of the following is present in an antacid tablet? (a) NaOH (b) Mg(OH)2 (c) Al(OH)3 (d) either (b) or (c) Answer: (d) either (b) or (c)

Question 4. Brand new acid present in whole milk try ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acid (a) Acetic acid Address: (a) Lactic acid

Question 5. Consider the pursuing the comments. (i) Acidic tastes bad (ii) Acidic turns reddish litmus so you can blue (iii) Acid reacts with precious metals and you can liberates hydrogen gasoline

And this of more than report are We are right? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) just Respond to: (c) (i) (iii)

Matter six. Think about the pursuing the comments. (i) Acid preferences sour. (ii) Acid transforms bluish litmus so you’re able to purple (iii) Acidic has a tendency to deal with good proton from other compounds.

And therefore of your above report is We aren’t correct? (a) (i) (ii) (b) (ii) (iii) (c) (iii) merely (a) (ii) only Answer: (c) (iii) just

Question 7. Which of the following can act as an acid as well as a base by Lowry – Bronsted theory? (a) H2O (b) NH3 (c) NH4OH (d) Ca(OH)2 Answer: (a) H2O

Question 8. In the reaction HCI + H2O \(\rightleftharpoons\) H3O + Cl – which one of the acid-base pair? (a) HCl + H3O + (b) HCI + CI – (c) H3O + Cl (d) H2O + Cl – Answer: (b) HCI + CI –

Question 9. Which of the following is considered Lewis acid? (a) NH3 (b) BF3 (c) HF (d) HCl Answer: (b) BF3

Question 10. Which of the following is considered as Lewis base? (a) BF3 (b) AICI3 (c) HCI (d) NH3 Answer: (d) NH3

Lascia un commento