2007-02-23 19:34:32 · 8 answers · asked by sshashis 1 in Science & Mathematics ➔ Engineering
pH is the acronym for "power of Hydrogen." It is a measure of the net active concentration of H+ ions (protons) in the solution.
The pH scale is a logarithmic scale defined as the negative of the power to which to raise 10 to get the mole concentration of H+ ions in one litter of the host solution. Pure water at 1 atm pressure and 25 degree C has a pH of 7 because a balance between the molecular bonding forces against the agitation internal energy generated by the temperature and the pressure causes it to free about 10^(-7) moles of H+ ions per litter (and an equal concentration of OH- ions). As the concentration of Hydrogen increases the solution becomes more acidic but the pH number goes down. This backward counting in step of 10 was because early scientists, and their log-slide rulers, favored to use pH 7, and not pH -7, for pure water.
The pH scale can go into negative range and can go beyond 14. Soap has a pH of about 10 and lemon juice about 2.
2007-02-23 20:46:18 · answer #1 · answered by sciquest 4 · 0⤊ 0⤋
<7
2007-02-24 19:36:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
In agreement with other posters, I do not add baking soda to the fish tank. I use coral pellets and sea shells which have been soaked to get out the salt residues. I change the fish tank water each week with filtered water only changing half at a time. The purpose in changing half at a time is to maintain the bio flora while reducing the organics. If you want to be more specific, then test the pH of the water going into the tank first using litmus paper.
2016-05-24 05:03:19 · answer #3 · answered by Anonymous · 0⤊ 0⤋
pH is a measure of the acidity or basicity of a solution. Solutions with a pH less than seven are considered acidic, while those with a pH greater than seven are considered basic. pH 7 is defined as neutral
2007-02-23 19:46:57 · answer #4 · answered by nav 2 · 0⤊ 0⤋
ph value in water is 7.i.e neutral
2007-02-23 19:58:10 · answer #5 · answered by *♥SwEeTy♥* 6 · 0⤊ 0⤋
it is 7..i.e. neutral...
as salts are responsible for causing the hardness...
and ph value is dependent on aicdic and basic nature ...
2007-02-23 19:40:45 · answer #6 · answered by friendship.. with.. sky.. 1 · 0⤊ 0⤋
pH has to do with acidity and alkalinity. Hardness generally refers to other dissolved minerals. Different subjects.
2007-02-23 20:10:23 · answer #7 · answered by ZORCH 6 · 0⤊ 0⤋
no idea
2007-02-23 19:39:25 · answer #8 · answered by vishal g 2 · 0⤊ 0⤋