GENERAL KNOWLEDGE

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GK

CHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A sample of acid has a proton concentration 1, 000 times greater than pure water. A sample of base has a proton concentration 10, 000 times less than pure water. What is the approximate pH of two samples?
A
4, 11
B
10, 3
C
11, 4
D
3, 10
Explanation: 

Detailed explanation-1: -A logarithmic scale condenses the range of acidity to numbers that are easy to use. For example, a solution in which [H+]=1.0×10−4M has a hydrogen-ion concentration that is 1000 times higher than in pure water. The pH of such a solution is 4.00, a difference of 3 pH units.

Detailed explanation-2: -The hydrogen ion concentration is 1.0 x 10−7M. The exponent of 10 is-7, which denoted that pH=-(-7) = 7. The solution is neutral.

Detailed explanation-3: -A pH of 5 has 100 times the concentration of hydrogen ions than a solution at pH 7. pH 4 is 1000 times, and a pH of 3 has 10, 000 times the hydrogen ion concentration.

Detailed explanation-4: -The pH of a solution with a hydrogen ion concentration of 1.0×10−8 1.0 × 10 − 8 M is 8.00.

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