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forums.studentdoctor.net/threads/why-does-adding-water...

In a way that makes sense, since the weaker the acid is, the more the water is contributing to the pH, so adding more water should not be so important. A short summary: For an acid with pKa=2 and [HA]=1 [A]=1 doubling the water changes pH by 0.4% If we drop the pKa a bit, say pKa=5, [HA]=1 [A]=1 doubling the water changes pH by 0.00017%

www.chemcollective.org/activities/tutorials/buffers/buffers2

If we add a strong acid or strong base to water, the pH will change dramatically. For instance, adding a strong acid such as HCl to water results in the reaction HCl + H 2 O → H 3 O + + Cl-. In other words, the proton (H +) from the acid binds to neutral water molecules to form H 3 O + raising the concentration of H +.

sciencing.com/does-salt-change-ph-water-4577912.html

In terms of pH, it doesn’t get more pure than H 2 O. Water sits in the middle of the pH, or potential hydrogen, scale. Pouring table salt into a glass of water won’t change that. To understand why not, it’s essential to have a basic understanding of the pH scale and what kind of reactions must happen in order for solutions to move up and down that scale.

www.youtube.com/watch?v=xvCSd0tyfco

Find out what adding acid to water does to the pH level with help from an experienced chemistry professional in this free video clip. ... Chemistry 3/17 Dilution and pH changes - Duration: 6:09 ...

www.quora.com/Why-does-diluting-buffer-with-water-not...

If a buffer is diluted, the pH does change because the equilibrium shifts. Also, the activity coefficients of species are concentration dependent. If a buffer is diluted extensively, the solution approaches pH 7.0. Since you have a variety of answers to choose from, I will back this one up with a reference:

answers.yahoo.com/question/index?qid=20101205180532AA1WYG0

Since pH is a measure of the hydrogen ion concentration, when you dilute the acid solution, the pH must go up. With a pH of 4, the hydrogen ion concentration is 1x10^-4M. Doubling the volume of the solution by adding more water will cut the concentration in half, or 5x10^-5M. The pH is the -log of the hydrogen ion concentration.

answers.yahoo.com/question/index?qid=20090308195006AA5oyrs

If you add 1L of water, the concentration of these species change, (to 1mol/L and 1.5mol/L) but they change by EXACTLY the same amount and the ratio doesn't change. in both instances the ratio is 2:3 and 1:1.5 = 2:3. That is why when you are considering buffered solution, the pH remains unaffected upon dilution.

www.answers.com/Q/Does_adding_water_change_the_pH_of_a...

Does adding water change the pH of an acid? Yes it does. pH is defined as the -log of the concentration of hydrogen ions in a solution, or -log[H + ]. As you add water to an acid, you are diluting ...

sciencing.com/raise-ph-level-water-6504653.html

To raise the pH level of the water in a fish tank, 1 teaspoon of baking soda per 5 gallons of water is a safe amount for small incremental increases. Dissolve the baking soda in water, add this mixture to the tank (after you remove the fish) and stir well.

homeguides.sfgate.com/ph-water-affect-ph-soil-74237.html

How Water pH Can Overwhelm the Buffering Capacity of a Soil. In normal rainwater and acid rain, there are excess hydrogen ions that can change soil pH by displacing calcium, aluminum and magnesium ...