What makes the pH of water in an aquarium to go up?
539761
It because fish produce ammonia which dissolves to form ammonia solution. The ammonia solution is basic thus it increases the pH of water in the aquarium.
448790
Alkalinity is usually measured by the presence of bicarbonate (HCO3-) and carbonates (CO3=) and acts to buffer water from acidic inputs, thus is a measure of the buffering capacity of water. Water with high alkalinity have high pH values while water with low alkalinity have low pH values. The hardness of the water is usually determined by the amount of calcium and magnesium salts present in water and is associated with the presence of carbonates. Hard water is generally more productive than soft water waters and can accept more input of salts, nutrients, and acids to their system without change than can soft water waters. So basically, it’s because of the presence of the magnesium. \n\nHope this helps and hope I didn’t confuse you.
84665
Air bubbles float up in water due to buoyancy because they displace the weight of water equal to their volume.  Water pressure is greated at greater depths therefore there is slightly more hydraulic pressure upwards on the bottom of the bubble than downwards on the top and the bubble is pushed upwards.  As the air bubble rises the pressure is reduced allowing the bubble to grow and it increases in volume and buoyancy as it travels to the surface.  This effect can also release and grow excess nitrogen in the blood of a diver causing growing nitrogen bubbles that cause great pain or even death and is called the bends (occurring especially in large joints that bend).\n\nOf course, soap bubbles float up in air due to air currents.  In a still room they float down to the floor and pop!
710860
The American educational system is doomed.\n\nb) base is the best answer. The more basic, the higher the pH. More acidic=lower pH. Neutral=pH of 7 (pure water). Lemon juice would have a pH of 2 or so. Hydrochloric acid is near zero. Drain cleaner is like 13.\n\nAt least they still teach people how to use computers!
809057
First of all, basic solutions contain more Hydroxide ions OH- than hydronium ions H3O+ (also known as H+)\n\nAny substances that when dissolved (ionized) in water and produces OH- ions are basic: NaOH becoes Na+ and OH-. NaOH is thus basic\n\nWe know that only weak bases/acids will produce a salt through neutralization which will affect the pH of the solution. For example, the conjugate acid of NH3 is NH4+. NH4+ can react will H2O to form NH3 and H3O+. Therefor, the solution will be more acidic. So we can conclude that positve charged ion can make the solution more acidic and negatively charged ions will make the solution more basic.\n\nHope this helps.
931995
limestone minerals buffer the acid rain.  The acid reacts with the calcite, etc. in limestone and changes it to more neutral or even slightly basic.  Our groundwater, therefore, tends to have a higher pH even though the pH of rainwater is low.
282642
actually, pure water does not have a pH of 7.0, it is slightly acidic, around 5.6-5.8 from what i have seen at work.
866949
<--------- 7 ---------->   (pH)\nacid                base\n\nthe smaller pH the stronger acid\nthe bigger pH the stronger base\n\nso you should arrange them from the smallest pH to the biggest\nstomach content (1.6)\nsoda pop (3)\nmilk (6.5)\nfresh water (7, of course neutral)\nhuman blood (7.4)\nsea water (8.7)\ndrain cleaner (8.7)
949101
That depends on the source you get it from!\n\nIn theory, water has a pH of 7.  If you could separate it from all influences, the disassociation constant of water would keep about 10^-7 M amounts of both [H+] and [OH-].  If you distill pure water and measure the pH, that's what you'll get.\n\nOver a couple hours the pH will change as the pure water absorbs carbon dioxide from the atmosphere.  This reacts with the water to form carbonic acid, lowering the pH to about 5.8.\n\nIn rain and the like, this effect has been countered, however, with other impurities that react with the carbonic acid, as well as producing their own effects.  Sea water has a pH of about 8.0, while water from streams and rain is usually closer to 7.
184683
pH is the measure of acidity or basicity(alkalinity) of a solution. When pH increases, the solution is more alkaline and when pH decreases the solution is more acidic. A pH of 7 implies that the solution is neither basic(alkaline) nor acidic but neutral. Check the answer to one of the similar questions on Yahoo answers at the following page.
568277
Yeah, it can be done with just the line.  \nFirst, locate the end point on the line.  It's exactly the midpoint of the sharp pH rise or drop.  Next, find exactly half the end point, where the moles of salt equal the moles of whatever you're adding.  At that point, pKa = pH.
148348
Perhaps a little less than pH=7. You can try pH=6, due to acidic rain (decreases the pH of lake), then again it really depends on the size of the lake, because of the buffer solution (ionic equilibria in chemistry) present in the lake and all.\n\nIf you know the concentration of H+ ions in the lake, all the better. The pH will be: pH=-log[H+].
955707
At higher or lower pH levels, Dissolved oxyegn (DO) level can be changed and start redox reactions that may lose DO in the water.
804094
dissociation of co2 in water produces produces an acid proton:\n\nCO2 + H2O ⇌ HCO3− + H+\n\nKa = 4.30×10−7 mol/L; pKa = 6.36. \n\nwithout knowing the amount of CO2 or water you used, it is impossible to calculate the pH.\n\nassuming its a 0.1M solution (0.1mol of CO2 dissolved in 1dm³ of water), pH would be around 3.7, whereas strong acids would hit pH 0 at far lower concentrations.
313595
Water... its got a pH=7
610740
Your blood keeps its pH range stable.
682738
There is a product made by HTH called pH Minus. (I'm sure there are other company's that make it as well), it's fairly inexpensive, around $14.00 for 1/2 gal. Just follow the directions and your water will be back to normal in no time at all. It works quickly! GOOD LUCK!