Tag: acids, bases and salts

Questions Related to acids, bases and salts

Where does the equivalence point occur on a titration curve for a strong acid/strong base titration?

salts salts and their classification acids, bases and salts chemistry

  1. At the endpoint, after pH 7.

  2. At pH 7, in the middle of the dramatic slope.

  3. At the very end of titration, between pH 10-12.

  4. Before the slope increases dramatically, between pH 2 and 4.

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Correct Option: B
Explanation:

The equivalence point occur at pH 7, in the middle of the dramatic slope,
on a titration curve for a strong acid/strong base titration.
At the equivalence point, the salt of strong acid and strong base is completely hydrolyzed which gives a neutral solution with pH 7 as hydrogen ion concentration is equal to hydroxide ion concentration.

$0.1\ M\ H _2SO _4$ has the same concentration of $H^+$ ions as $0.1 N HCl$.

salts salts and their classification acids, bases and salts chemistry

  1. True

  2. False

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Correct Option: B
Explanation:

0.05 M $\displaystyle H _2SO _4$  has the same concentration of $\displaystyle H^+$ ions as 0.1 M HCl.
 0.05 M $\displaystyle   H _2SO _4$  $\displaystyle  = 2 \times 0.05 = 0.1$ M $\displaystyle H^+$ ions.
 0.1 M HCl $\displaystyle  = 0.1$ M $\displaystyle H^+$ ions.

Identify acidic salt which can react with one mole of base among the following.

chemistry acids, bases and salts metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

  1. $(NH _{4}) _{2}CO _{3}$

  2. $Na _{2}HPO _{3}$

  3. $NaH _{2}PO _{3}$

  4. $CH _{3}COOK$

Show answer
Correct Option: C
Explanation:

$H _3PO _3$ is a dibasic acid. In its structure, one oxygen atom is bonded to $P-$ atom via a double bond. $2$ $O-$atoms are bonded to $H-$atoms causing acidity. The third $H$ is directly attached to $P-$ atom responsible for its reducing behavior. 

In $NaH _2PO _3$, one acidic $H$ is replaced by $Na$. Only one $H$ is left which causes the acidic behavior in the salt and hence, will react with one mole of base.