2007-09-17 10:15:19 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
In theory, it's seven.
In practice, even high purity water contains a small amount of dissolved carbon dioxide, which lowers the pH.
Stick a calibrated pH probe in a beaker of pure, distilled water, and you'll likely get a pH reading somewhere in the 5.5 to 6 range.
2007-09-17 10:43:25 · answer #1 · answered by Ben H 6 · 0⤊ 0⤋
ph of 7
2007-09-17 17:19:56 · answer #2 · answered by Johneye 4 · 1⤊ 0⤋
Water hardness is often expressed as grains of hardness per gallon or water (gpg) or milligrams of hardness per liter of water (mg/L). Once the test results are know you can calculate the hardness in the water. The water hardness is relative to the amount of mineral content (calcium, magnesium) found in the water. For example if you have 10 gpg, then you have 10 grains of hardness for every gallon of wat
Soft
0–1
Slightly Hard
1–3.5
Moderately Hard
3.5–7.0
Hard
7–10.5
Very Hard
10.5 and up=[[[=Neutral water is given a pH value of 7.0. It contains equal amounts of hydrogen ions (H+) and hydroxide ions (OH-). Dissolved chemicals and minerals change the balance of those ions from a perfectly neutral state.
2007-09-17 17:19:57 · answer #3 · answered by Anonymous · 0⤊ 1⤋
pH = 7
Water's self ionization constant (Kw) = 1x10^-7
as we know, pH = -log[H+] = -log (1x10^-7) = 7
2007-09-17 17:27:09 · answer #4 · answered by lhvinny 7 · 0⤊ 0⤋
7.00 at 25 C
2007-09-17 17:18:54 · answer #5 · answered by Tom R 2 · 1⤊ 0⤋