Chemistry, 27.11.2019 00:31 milkshakegrande101

Sodium carbonate (na2co3) is available in very pure form and can be used to standardize acid solutions. what is the molarity of an hcl solution if 24.3 ml of the solution is required to react with 0.246 g of na2co3?

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Answer from: lyly214

Molarity of HCl = 0.19 M

Explanation:

Moles of Na_2CO_3 :-

Mass = 0.246 g

Molar mass of Na_2CO_3 = 105.988 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{0.246\ g}{105.988\ g/mol}$

$Moles_{Na_2CO_3}= 0.002321\ mol$

According to the given reaction:-

$Na_2CO_3+2HCl\rightarrow 2NaCl+H_2O+CO_2$

1 mole of Na_2CO_3 react with 2 moles of HCl

0.002321 mole of Na_2CO_3 react with 2*0.002321 moles of HCl

Moles of HCl = 0.004642 moles

Given that volume = 24.3 mL

Also,

$1\ mL=10^{-3}\ L$

So, Volume = 24.3 / 1000 L = 0.0243 L

Considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

$Molarity=\frac{0.004642}{0.0243}$

Molarity of HCl = 0.19 M

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

Mass is the amount of matter in an object. weight is the measurement of the pull of gravity on an object. say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165) now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon. however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant. in conclusion it is possible for your weight to change as your mass remains constant.

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