A student measured the pH of four solutions. Which pH indicates the highest hydronium ion concentration? 3.2 7.0 9.1 12.4
2 answers:
Answer: 3.2
Explanation:
pH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
Thus as pH and are inversely related, a solution having lower pH will have more amount of
concentration. And a solution having more pH will have less amount of
concentration.
Thus the solution with lowest pH of 3.2 will have highest hydronium ion concentration.
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Answer:
Angular acceleration,
Explanation:
It is given that,
Mass of the solid sphere, m = 245 g = 0.245 kg
Diameter of the sphere, d = 4.3 cm = 0.043 m
Radius, r = 0.0215 m
Force acting at a point, F = 0.02 N
Let is its angular acceleration. The relation between the angular acceleration and the torque is given by :
I is the moment of inertia of the solid sphere
For a solid sphere,
So, its angular acceleration is . Hence, this is the required solution.