What is the conjugate acid of HCO_3^-? co_3^2- H_3O^+ H_2CO_3 CO_2 in the acid-b

Question

What is the conjugate acid of HCO_3^-? co_3^2- H_3O^+ H_2CO_3 CO_2 in the acid-base reaction between H_2CO_3 and NH_3, which of the following is a conjugate pair? H_3CO_3 and OH^-NH_3 and H_2CO_3 H_2CO_3 and NH_4^+ NH_3 and H_2O None of the above how many mL of 0.1 M Ba(OH)_2(aq) are needed to neutralize 100 mL of 0.1 M Hcl(aq)? 50 mL 100 mL 200 mL what is the net ionic equation for HF(aq) reacting with NaOH(aq)? HF(aq) + NaOH(aq) rightarrow NaF(aq) + H_2O(l) HF(aq) + OH^-(aq) rightarrow F^-(aq) + H_2O(l) H^+(aq) + OH^-(aq) rightarrow h_2O(l) HF(aq) + Na^4(aq) rightarrow NaF(aq) + H^+(aq) What is oxygen's ON in HOF? -2 -1 0 +1 what is oxygen's ON in H_2O? -2 -1 0 +1 oxygen has ON = -2 in Cr_2O_7^2-. What is the ON of Cr? 0 +2 +6 +12 what is nitrogen's ON in HNO_3? +5 +3 0 -1

Explanation / Answer

Lecture-20:

Quiz-3: We obtain the conjugate acid of a species by adding H+ ion to the species. Hence the conjugate acid of HCO3- is H2CO3. Hence ption (C) is correct.

Quiz-4: When H2CO3 reacts with NH3, H2CO3 acts as weak acid and NH3 acts as weak base forming the following products.

H2CO3 + NH3 ------- > HCO3- + NH4+  

Here the cnjugate acid base pairs are H2CO3, HCO3- and NH3, NH4+  

Hence option (E) non of the above are correct.

Quiz-5: The balanced equation for the reaction of Ba(OH)2 with HCl is

Ba(OH)2 + 2HCl ------ > BaCl2 + 2H2O

From the above reaction it is clear that 1 mol of Ba(OH)2 reacts with 2 mol of HCl.

Hence 100 mL of 0.1 M HCl will react with 50 mL of 0.1 M Ba(OH)2.Hence option (A) is correct.

Quiz-6: The balanced chemical reaction is

HF(aq) + NaOH(aq) ------ > NaF(aq) + H2O

NaOH and NaF are completely dissociated. Hence

HF(aq) + Na+(aq) + OH-(aq) ------- > Na+(aq) + F-(aq) + H2O

Now canceling Na+(aq) from both sides we get the net ionic equation as

HF(aq) + OH-(aq) ------- > F-(aq) + H2O

Hence option (B) is correct.

Lecture-21:

Quiz-1: The ON of Hydrogen is +1 and fluorine is +1. Hence

+1 + x + (+1) = 0

=> x = -2

Hence option (A) is correct.

Quiz-2: ON of hydrogen is +1. Hence ON of oxygen is -2. Hence option (A) is correct.

Quiz-3: 2x + 7 x (-2) = -2

=> 2x = 12

=> x = +6

Hence option (C) is correct.

Quiz-4: ON of hydrogen is +1 and O is -2. Hence

+1 + x + 3 x (-2) = 0

=> x = +5

Hence option (A) is correct

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