An reading of 8 on the pH scale is indicative of?
2 answers:
Answer:
Explanation:
The pH scale which classifies a solution's acidity or basicity.
- A pH below 7 is acidic. This means it has more hydrogen ions.
- A pH equal to 7 is neutral. This has equal hydrogen and hydroxide ions.
- A pH above 7 is basic. This has more hydroxide ions.
We are given a reading of 8. This is above 7, but not much greater. Therefore, it could be classified as a weak base.
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Answer : The time required for decay is, 84 days.
Explanation :
Half-life of chromium-51 = 28 days
First we have to calculate the rate constant, we use the formula :
Now we have to calculate the time required for decay.
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = time taken by sample = ?
a = let initial activity of the sample = 100
a - x = amount left after decay process = 12.5
Now put all the given values in above equation, we get
Therefore, the time required for decay is, 84 days.