Discussion
What is the pH of a solution whose hydrogen ion activity is one thousandth of a mole per litre?
Answer: B
Taking the negative logarithm of a thousandth gives 3, since ten to the power minus three has a logarithm of minus three. The scale runs conveniently from about 0 to 14 in water at room temperature because the ion product of water is ten to the minus fourteen. A value of 1 would need a tenth molar activity and 11 would be alkaline. Getting comfortable with the logarithmic step is essential, since one pH unit is a tenfold change in activity and instrument resolution of 0.01 units means one part in a hundred of that decade.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development