Question
Asked Mar 13, 2020
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Use Apendix C or Figure 18.9 to determine whether Kc > 1 or Kc < 1 for each reaction. 

(a) H2SO3 + NH3 HSO3- + NH4+

Kc < 1 or Kc > 1    

(b) HCN + HCO3- H2CO3 + CN -

Kc < 1 or Kc > 1    
ACID
BASE
НС
CI-
H2SO4
HSO4
Negligible
Strong-
HNO3
NO3
Нзо*
Нао
HSO4
so,2-
H2SO3
HSO3
H3PO4
HаРОд-
HF
CH3COOH
CH3COO
H2CO3
НCО3"
Weak
Weak< H2S
HS
HSO3
sog2-
H2PO4
НРО,2-
NH4+
NH3
НСОЗ
co,2-
НРО,2-
PO,3-
H20
OH"
s2-
Strong
HS-
Negligible-
он-
02
ACID STRENGTH
BASE STRENGTH
help_outline

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ACID BASE НС CI- H2SO4 HSO4 Negligible Strong- HNO3 NO3 Нзо* Нао HSO4 so,2- H2SO3 HSO3 H3PO4 HаРОд- HF CH3COOH CH3COO H2CO3 НCО3" Weak Weak< H2S HS HSO3 sog2- H2PO4 НРО,2- NH4+ NH3 НСОЗ co,2- НРО,2- PO,3- H20 OH" s2- Strong HS- Negligible- он- 02 ACID STRENGTH BASE STRENGTH

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Expert Answer

Step 1

The acid donates the proton to form its conjugate base and the base accepts a proton to form its conjugate acid.

When an acid is dissolved in water, the acid (HA) donates a proton to water to form a new acid (conjugate acid) and a new base (conjugate base).

The pair of an Acid -Base differs by a proton called conjugated Acid-Base pair.

In acid - base reaction, if the stronger acid produces the weaker acid which tells that the reaction favors the products, and the Kc value is greater than one (Kc > 1). If the weaker acid produces the stronger acid which tells that the reaction favors the reactants, and the Kc value is less than one (Kc < 1).

Step 2

(a) The given reaction is,

Chemistry homework question answer, step 2, image 1

Comparing to ammonium ion (NH4+), sulfurous acid (H2SO3) is stronger. It implies that the stronger acid produces the weaker acid. Therefore, for the given reaction Kc > 1.

...

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