Chemistry, 16.01.2020 18:31 jacksoneaton

An analytical chemist determines that an estuarine water sample contains 1.5 g/liter of sulfate ion (so4 2). what is the concentration in terms of: (a) g/l of sulfur? (b) molar concentration of sulfate? (c) normality?

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Answer from: 1Slowbow

Explanation:

It is known that molar mass of $SO^{2-}_{4}$ is as follows.

Molar mass = $32 + (4 \times 16)$

= 96 g/mol

It is given that the concentration of $SO^{2-}_{4}$ is 1.5 g/L.

(a) As 96 g of $SO^{2-}_{4}$ contains 32 grams of Sulfur in 1 L. And, 1.5 g of $SO^{2-}_{4}$ contains x grams of sulfur in 1 L.

Therefore, value of x is calculated as follows.

x = $\frac{1.5 \times 32}{96}$

= 0.5 g/L

Hence, the concentration of sulfur is 0.5 g/L.

(b) Now, calculate the molar concentration of sulfur as follows.

Molarity = $\frac{\text{conc. of sulfate}}{\text{molar mass of SO^{2-}_{4}}}$

= $\frac{1.5 g/L}{96 g/mol}$

= 0.0156 M

Therefore, the molarity of given sample is 0.0156 M.

Equivalent mass of $SO^{2-}_{4}$ = $\frac{96}{2}$

= 48 g/mol

Normality = $\frac{conc. of SO^{2-}_{4} in g/L}{equivalent mass of SO^{2-}_{4}}$

= $\frac{1.5 g/L}{48 g/mol}$

= 0.03125 N

Hence, the normality of given sample is 0.03125 N.

Answer from: Quest

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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.