Write a balanced chemical equation for the following neutralization reaction producing a soluble salt: Carbonic acid, H2CO3H2CO3, neutralizes a sodium hydroxide solution. Assume both equivalents of hydrogen ions in the acid react.

H₂CO₃ (aq)  +  2NaOH(aq)  →   Na₂CO₃ (aq) +  2H₂O(l)

Explanation:

In a reaction of neutralization you produce water and the salt derived from the acid and the base that has reacted.

Carbonic acid dissociates as this:

H₂CO₃ (aq) + H₂O (l)  ⇄  H₃o⁺  (aq) +  HCO₃⁻ (aq)   Ka₁

HCO₃⁻ (aq) + H₂O (l) ⇄ H₃O⁺ (aq)  +  CO₂²⁻ (aq)     Ka₂

Sodium hydroxide dissociates as this:

NaOH (aq) ←  Na⁺ (aq)  +  OH⁻(aq)

So OH⁻ bonds to the H₃O⁺ to make water.

H₃O⁺  +  OH⁻ ⇄  2H₂O     Kw

The reaction for neutratlization is:

H₂CO₃ (aq)  +  2NaOH(aq)  →   Na₂CO₃ (aq) +  2H₂O(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.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.