Answer:

Step-by-step explanation:
a hemisphere is half a sphere.
And if the formula for the volume of a sphere is:

we must calculate the volume of the sphere and in the end divide by two to find the volume of the hemisphere.
Since the radius is:

substituting this into the formula for volume:

this is the volume of the total sphere, thus the volume of a hemisphere is:

rounding to the nearest tenth:

2x2 [4x 3x]
[12x 8x] I found the answer on the app math papa.
Addition of a hydronium ion increases its concentration and the solution becomes more acidic, Therefore the pH decreases.