Chemistry, 29.01.2020 10:51 adamflex

The ph of a 0.55 m aqueous solution of hypobromous acid, hbro, at 25.0°c is 4.48. what is the value of ka for hbro?

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Answer from: debrielcalderon

The value of dissociation constant for the hypobromous acid is $1.993\times 10^{-9}$ .

Explanation:

The pH of the solution = 4.48

Concentration of hypobromous acid, [HBrO]=c=0.55 M

The equilibrium reaction for dissociation of HBrO (weak acid) is,

$HBrO\rightleftharpoons OBr^-+H^+$

initially conc. c 0 0

At eqm. $c(1-\alpha )$ $c\alpha$ $c\alpha$

First we have to calculate the concentration of value of degree of dissociation $\alpha$ .

Expression for dissociation constant is given as:

$k_a=\frac{(c\alpha )(c\alpha )}{c(1-\alpha )}=\frac{c(\alpha )^2}{(1-\alpha )}$ ..(1)

$[H^+]=c\alpha$

$pH=4.48=-\log[H^+]=-\log[c\alpha ]=-\log[0.55 M\times \alpha ]$

$\alpha =6.0205\times 10^{-5}$

Substituting all the values in (1), we get the value of dissociation constant:

$K_a=\frac{0.55 M(6.0205\times 10^{-5})^2}{(1-(6.0205\times 10^{-5}))}$

$K_a=1.993\times 10^{-9}$

The value of dissociation constant for the hypobromous acid is $1.993\times 10^{-9}$ .

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

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The ph of a 0.55 m aqueous solution of hypobromous acid, hbro, at 25.0°c is 4.48. what is the value...

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