Answer:
Thermometer A, because it measures accurately to the tenths digit.
the second statement is the correct one quarks are needed to balance charges in all subatomic particles such as neutrons, protons and electrons
Answer:
6.68 X 10^-11
Explanation:
From the second Ka, you can calculate pKa = -log (Ka2) = 6.187
The pH at the second equivalence point (8.181) will be the average of pKa2 and pKa3. So,
8.181 = (6.187 + pKa3) / 2
Solving gives pKa3 = 10.175, and Ka3 = 10^-pKa3 = 6.68 X 10^-11
