Ex pH<7 due to the absorption of CO2 from the air.
H2O+CO2-->H2CO3
So what would happen to the pH in the water if it was boiled. Thanks
2007-02-26 05:09:42 · 9 answers · asked by Angel Eve 6 in Science & Mathematics ➔ Chemistry
If you boil the water and then let it stand in the container, the pH should be about the same as it was before you boiled it. You would need air with high concentrations of CO2 in order to get the water to absorb enough to adjust the pH. If, on the other hand, you were to boil the water and then collect the steam and condense it, it will be acidic (around 6.0 pH). That is because pure water is acidic, while the tap water you started with has carbonate and other compounds that tend to raise the pH.
2007-02-26 10:27:06 · answer #1 · answered by griffinpilot1965 3 · 0⤊ 1⤋
I use a memory tool to answer this question. To dissolve a solid into solution divide the solid, stir the solution or heat the solution. To dissolve a gas, do the opposite.
So with that said heating would drive out the CO2. And yes CO2 makes a difference. There is an equilibrium in aqueous systems between CO2 and carbonic acid.
So boiling DI water will temporarily drive the pH down towards 7. And if you cover the solution in a blanket of Argon while boiling you can keep it close to a neutral pH for quite sometime. Never heat a closed system.
2007-02-26 05:30:23 · answer #2 · answered by James H 5 · 2⤊ 0⤋
The dissolved carbon dioxide will be driven out and as a result will have no effect on the pH. But temperature has an effect on the Dissociation constant of water and therefore on the pH of water.
As a frequently used special case, the dissociation constant of water is often expressed as Kw:
Kw = [H + ][OH − ]
The concentration of water is not included in the definition of Kw.
The value of Kw varies with temperature and this variation must be taken into account when making precise measurements of quantities such as pH.
Kw at room temperature is 0.7 x 10^-14 mol/litre, which transfers to a pH of 7.0774. At the boiling point of water the Kw value is 73 x 10^-14 mol/litre, which transfer to a pH of 6.0683. In heating and boiling water the concentration of H3O+ ions increases with temperature, and as a result it becomes slightly acidic. All other answer seems to ignore the effect of temperature has on the dissociation constant of water.
2007-02-26 05:51:54 · answer #3 · answered by The exclamation mark 6 · 0⤊ 0⤋
once you boil water, dissolved gasses (CO2, O2, etc) spoil out. If the water is organic and deionized, the pH gained't substitute, because the molecular makeup of water does no longer substitute.
2016-12-04 23:40:05 · answer #4 · answered by rieck 4 · 0⤊ 0⤋
As you boil the water, the concentration of dissolved solids would increase. Depending on the acidity or alkalinity of the solids, the pH will increase (go slightly basic) or decrease (slightly acidic).
Absorbed gases will boil out.
2007-02-26 05:32:04 · answer #5 · answered by Norrie 7 · 0⤊ 0⤋
I'm no chemist, but it seems to me that if you removed water from the equation the pH level in the remaining water would skew towards the end of the scale to which it was already leaning.
If it were balanced perfectly to start with, then boiling would do nothing.
2007-02-26 05:23:50 · answer #6 · answered by Uncle Remus 4 · 0⤊ 3⤋
Nothing happens to water. Water is H20 and your equation is creating a new product that is not water.
2007-02-26 05:14:27 · answer #7 · answered by Anonymous · 0⤊ 3⤋
I think there'd have to be a chemical reagent, I think you'd call it, for anything to happen. Water, alone, in heat, just evaporates.
2007-02-26 05:13:44 · answer #8 · answered by vanamont7 7 · 0⤊ 3⤋
If you are not careful it could blow up.
2007-02-26 05:19:07 · answer #9 · answered by Sarbazeirani 2 · 0⤊ 3⤋