What is the ph when 5.0 ml of 0.010 m barium hydroxide is added to 20.0 ml of 0.020 m nitric acid 12.08 1.92 12.15 1.85

Answer is: pH is 1.92.

Balanced chemical reaction: Ba(OH)₂ + 2HNO₃ → Ba(NO₃)₂ + 2H₂O.

V(Ba(OH)₂) = 5.0 mL ÷ 1000 mL/L.

V(Ba(OH)₂) = 0.005 L; volume of barium hydroxide.

c(Ba(OH)₂) = 0.010 M; molarity of barium hydroxide.

n(Ba(OH)₂) = V(Ba(OH)₂) · c(Ba(OH)₂).

n(Ba(OH)₂) = 0.00005 mol; amount of barium hydroxide.

n(HNO₃) = 0.0004 mol; amoun of nitric acid.

From balanced chemical reaction: n(Ba(OH)₂) : n(HNO₃) = 1 : 2.

Δn(HNO₃) = 0.0004 mol - 0.0001 mol.

Δn(HNO₃) = 0.0003 mol; excess of nitri acid.

Δc(HNO₃) = 0.0003 mol ÷ 0.025 L.

Δc(HNO₃) = 0.012 M.

pH = -log(0.012 M).

pH = 1.92.

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.

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