Avolume of 55.6 ml of aqueous potassium hydroxide is titrated against a standard solution of sulfuric acid. what was the molarity of the potassium hydroxide solution if 15.1 ml of 1.50 m sulfuric acid was needed

The molar concentration of the potassium hydroxide solution was 0.815 mol/L.

Balanced equation: 2KOH + H_2SO_4 → K_2SO_4 + 2H_2O

Moles of H_2SO_4:

15.1 mL H_2SO_4 × (1.50 mmol H_2SO_4 /1 mL H_2SO_4)

= 22.65 mmol H_2SO_4

Moles of KOH: 22.65 mmol H_2SO_4× (2 mmol KOH/2 mmol H_2SO_4)

= 45.30 mmol KOH

Concentration of KOH: c= "moles"/"litres" = 45.30 mmol/55.6 mL

= 0.815 mol/L

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.