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Question

(a) Mention conjugate base of each of the following:
$$H{ S }^{ - },{ H }_{ 3 }{ O }^{ + },{ H }_{ 2 }{ PO }_{ 4 }^{ - },H{ SO }_{ 4 }^{ - },HF,{ CH }_{ 3 }COOH,{ C }_{ 6 }{ H }_{ 5 }OH,HCl{ O }_{ 4 },{ NH }_{ 4 }^{ + }$$
(b) Mention the conjugate acid of each of the following:
$${ OH }^{ - },{ CH }_{ 3 }CO{ O }^{ - },{ Cl }^{ - },{ CO }_{ 3 }^{ 2- },{ H }_{ 2 }{ PO }_{ 4 }^{ - },{ CH }_{ 3 }{ NH }_{ 2 },{ CH }_{ 3 }COOH,{ NH }_{ 2 }^{ - }\quad $$
(c) Which of the following behave both as Bronsted acids as well as Bronsted bases?
$${ H }_{ 2 }O,H{ CO }_{ 3 }^{ - },{ H }_{ 2 }{ SO }_{ 4 },{ H }_{ 3 }{ PO }_{ 4 },H{ S }^{ - },{ NH }_{ 3 }\quad $$
(d) Which is stronger acid in each of the following pairs?
$$HCl,HI;{ H }_{ 2 }{ CO }_{ 3 },{ H }_{ 2 }{ SO }_{ 4 };{ H }_{ 2 }O,{ H }_{ 2 }S;{ C }_{ 2 }{ H }_{ 5 }OH, C_6H_5OH$$
(e) Which is stronger base in each of the following pairs?
$${ OH }^{ - },{ Cl }^{ - };{ OH }^{ - },{ NH }_{ 2 }^{ - };{ OH }^{ - },{ CH }_{ 3 }CO{ O }^{ - };{ CH }_{ 3 }CO{ O }^{ - },{ Cl }^{ - };{ NH }_{ 3 },{ CH }_{ 3 }{ NH }_{ 2 }$$
(f) Classify the following into acids and bases according to Lewis concept:
$${ S }^{ 2- },{ H }^{ + },{ OH }^{ - },B{ F }_{ 3 },{ Ni }^{ 2+ },N{ F }_{ 3 },Al{ Cl }_{ 3 },Sn{ Cl }_{ 4 },{ NH }_{ 3 },{ ({ CH }_{ 3 }) }_{ 2 }O$$


Solution

(a) $${ S }^{ 2- },{ H }_{ 2 }O,H{ PO }_{ 4 }^{ - },{ SO }_{ 4 }^{ - },{ F }^{ - },{ CH }_{ 3 }CO{ O }^{ - },{ C }_{ 6 }{ H }_{ 5 }{ O }^{ - },Cl{ O }_{ 4 }^{ - },{ NH }_{ 3 }\quad $$

(b) $${ H }_{ 2 }O,{ CH }_{ 3 }COOH,HCl,H{ CO }_{ 3 }^{ - },{ H }_{ 3 }{ PO }_{ 4 },{ CH }_{ 3 }{ NH }_{ 3 }^{ + },{ CH }_{ 3 }COO{ H }_{ 2 }^{ + },{ NH }_{ 3 }\quad $$

(c) $${ H }_{ 2 }O,H{ CO }_{ 3 }^-;H{ S }^{ - }$$ and $${ NH }_{ 3 }$$ behave both as acids and bases.

(d) $$HI>HCl;{ H }_{ 2 }{ SO }_{ 4 }>{ H }_{ 2 }{ CO }_{ 3 };{ H }_{ 2 }S>{ H }_{ 2 }O;{ C }_{ 6 }{ H }_{ 5 }OH>{ C }_{ 2 }{ H }_{ 5 }OH$$

(e) $${ OH }^{ - }>Cl^-;{ NH }_{ 2 }^{ - }>{ OH }^{ - };{ OH }^{ - }>{ CH }_{ 3 }CO{ O }^{ - };{ CH }_{ 3 }CO{ O }^{ - }>{ Cl }^{ - };{ CH }_{ 3 }{ NH }_{ 2 }>{ NH }_{ 3 }$$

(f) Lewis acids are : $${ H }^{ + },B{ F }_{ 3 },{ Ni }^{ 2+ },Al{ Cl }_{ 3 },Sn{ Cl }_{ 4 }\quad $$
    Lewis bases are : $${ S }^{ 2- },{ OH }^{ - },N{ F }_{ 3 },{ NH }_{ 3 },{ ({ CH }_{ 3 }) }_{ 2 }O\quad $$

Chemistry

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