Solve

Guides

You visited us 0 times! Enjoying our articles? Unlock Full Access!

Chemistry

Question

Blood $p H$ is controlled by the concentrations of $H_{2} C O_{3}$ and $H C O_{3}^{-}$ . In the presence of $N a H C O_{3}$ , $p H$ of blood:
increases
decreases
does not change
first decreases and then increases

decreases

first decreases and then increases

increases

does not change

Open in App

Solution

Verified by Toppr

The correct option is A increases
Acidic buffer solution is prepared by mixing a weak acid and its salt with a strong base.
Thus, a mixture of $H_{2} C O_{3}$ and $H C O_{3}^{-}$ acts as an acidic buffer solution.
The expression for the pH of the acidic buffer solution is as given below:
$p H = p K_{a} + l o g \frac{[s a l t]}{[a c i d]}$
In the presence of $N a H C O_{3}$ , the concentration of salt increases. Hence, the term $l o g \frac{[s a l t]}{[a c i d]}$ increases. This increases the $p H$ of blood.

Was this answer helpful?

Similar Questions

Blood

p H

is controlled by the concentrations of

H_{2} C O_{3}

and

H C O_{3}^{-}

. In the presence of

N a H C O_{3}

p H

of blood:

View Solution

The pH of blood is 7.4. If the buffer in bloods is $C O_{2} a n d H C O_{3}^{-}$ , calculate the ratio of conjugate base to acid $(H_{2} C O_{3})$ to maintain the pH of the blood. Given $K_{1}$ of $H_{2} C O_{3} = 4.5 \times 10^{- 7}$

View Solution

The pH of blood stream is maintained by a proper balance of

H_{2} C O_{3}

and

N a H C O_{3}

concentration. What volume of

5 M

N a H C O_{3}

solution should be mixed with a

10

mL sample of blood which is

2 M

H_{2} C O_{3}

in order to maintain its pH?

View Solution

The importance of pH maintenance in blood.

Maintenance of the pH in blood and in intracellular fluids is absolutely crucial to the processes that occur in living organisms. This primarily because the functioning of enzymes-catalysts for these processes - is sharply pH dependent. The normal pH value of blood plasma is 7.4. Severe illness or death can result from sustained variations of a few tenths of pH unit.

Among the factors that lead to a condition of acidosis, in which there is a decrease in the pH of blood are heart failure, kidney failure diabetes mellitus, persistent diarrhoea or a long term high protein diet.A temporary condition of acidosis may result from prolonged, intensive exercise. Alkalosis, which causes increase in pH of blood may occur as a result of severe vomiting over breathing or exposure to high altitudes.

Several factors are involved in the control of the pH of blood. A particularly important one is the ratio of dissolved

H C O_{3}^{-}

H_{2} C O_{3}

C O_{2} (g)

is moderately soluble in water and in aqueous solution reacts only to a limited extent to produce

H_{2} C O_{3}

C O_{2} + H_{2} O ⇌ H_{2} C O_{3} (a q)

H_{2} C O_{3} + H_{2} O ⇌ H C O_{3}^{-} + H_{3} O^{+}

p K_{a_{1}} = 6.11

H C O_{3}^{-} + H_{2} O ⇌ C O_{3}^{2 -} + H_{3} O^{+}

p K_{a_{2}} = 10.25

In the

H_{2} C O_{3}

H C O_{3}^{-}

buffer system, we deal only with the first ionization step

(K_{a_{1}})

H_{2} C O_{3}

is a weak acid and

H C O_{3}^{-}

is the conjugate base (salt).

C O_{2}

enters the blood from tissues as the by -product of a metabolic reaction. In the lungs,

C O_{2}

(g) is exchanged for

O_{2}

(g), which is transported throughout the body by the blood.Important diagnostic analysis in the blood is :

View Solution

The

[H C O_{3}^{-}] / [H_{2} C O_{3}]

ratio in the blood (pH = 7.4) is approximately

(p K_{a} = 6.1 f o r H_{2} C O_{3})

log 20= 1.301

View Solution

Blood pH is controlled by the concentrations of H2CO3 and HCO3−. In the presence of NaHCO3, pH of blood: increasesdecreasesdoes not changefirst decreases and then increases

Blood $p H$ is controlled by the concentrations of $H_{2} C O_{3}$ and $H C O_{3}^{-}$ . In the presence of $N a H C O_{3}$ , $p H$ of blood:
increases
decreases
does not change
first decreases and then increases