What is the alkalinty of water?

Question

What is the alkalinty of water?

Answer 1

the alkalinity water is due to the presence of OH-, CO3 2-and HCO3 - ions(basic anions). the substances which are producing OH- ions by dissociation or by hydrolysis. So the OH- concentration increases, then the pH also increases.If the pH is increased then  water is known as alkaline.The pH of the potable water is 6.5 - 7.0.  

Answer 2

PH

over 7 is alkaline

under 6 is acid

Answer 3

pH range of 6.0 to 9.0

Answer 4

Alkalinity of water is 7 which means neutral, this is because the number of OH+ ions is equal to H+ ions.  

Answer 5

Water has acidity = alkalinity = 1.0x10^-7 M

To be specific, in water there is little H+ ion and also OH- ion, and in pure water, both of those have a concentration of 1x10^-7 M.

Take care,

David

Answer 6

Depends on ph value

Answer 7

Alkalinity refers to the capability of water to neutralize acid. This is really an expression of buffering capacity. A buffer is a solution to which an acid can be added without changing the concentration of available H+ ions (without changing the pH) appreciably. It essentially absorbs the excess H+ ions and protects the water body from fluctuations in pH. In most natural water bodies in Kentucky the buffering system is carbonate-bicarbonate (CO2HCO3 CO32-). The presence of calcium carbonate or other compounds such as magnesium carbonate contribute carbonate ions to the buffering system. Alkalinity is often related to hardness because the main source of alkalinity is usually from carbonate rocks (limestone) which are mostly CaCO3. If CaCO3 actually accounts for most of the alkalinity, hardness in CaCO3 is equal to alkalinity. Since hard water contains metal carbonates (mostly CaCO3) it is high in alkalinity. Conversely, unless carbonate is associated with sodium or potassium which don't contribute to hardness, soft water usually has low alkalinity and little buffering capacity. So, generally, soft water is much more susceptible to fluctuations in pH from acid rains or acid contamination

Answer 8

pure water is neutral. 7

Answer 9

Pure water has no alkalinity, and a pH of 7.0.  Pure water in equilibrium with atmospheric CO2 is about pH 5.0, but still has no alkalinity, because there are no cations for the CO2 to react with.

DK

Answer 10

There are two definitions of alkalinity.  The old and common definition is the same as basicity of water.  Or said another way, how much above 7 do you measure the pH.

The true definition is based on the buffering capacity of the water.  It is measured using a specific method or modification of the method (see references).  In fact most water has two alkalinities.  If a water has a pH above 8.3, you titrate down to pH 8.2.  The amount needed is called P-alkalinity.  If you titrate to pH 4.5, the amount needed is called T-alkalinity.  These are very important measurements when dealing with water in the environment and when dealing with water supplied to consumers.

Answer 11

Alkalinity refers to the capability of water to neutralize acid. This is really an expression of buffering capacity.

Answer 12

pure water isn't alkaline its PH is 7 if its PH is found less than 7 then its acidic or if it is more than 7 then its alkaline

Answer 13

Water is neutral....

Its ph value is 7 that is neither acidic nor basic.......