Using the Henderson-Hasselbalch equation on the solution before HCl addition: pH = pKa + log([A-]/[HA]) 8.0 = 7.4 + log([A-]/[HA]); [A-]/[HA] = 4.0. (equation 1) Also, 0.1 L * 1.0 mol/L = 0.1 moles total of the compound. Therefore, [A-] + [HA] = 0.1 (equation 2) Solving the simultaneous equations 1 and 2 gives: A- = 0.08 moles AH = 0.02 moles Adding strong acid reduces A- and increases AH by the same amount. 0.03 L * 1 mol/L = 0.03 moles HCl will be added, soA- = 0.08 - 0.03 = 0.05 moles AH = 0.02 + 0.03 = 0.05 moles Therefore, after HCl addition, [A-]/[HA] = 0.05 / 0.05 = 1.0 Resubstituting into the Henderson-Hasselbalch equation: pH = 7.4 + log(1.0) = 7.4, the final pH.
Answer:
natural selection does not cause a species to change
Explanation:
I believe that's what it is
Given:
Number of items = 25
Price per item = $18
<u>To determine:</u>
The total revenue
<u>Explanation:</u>
Total revenue = quantity * price per item
= 25 items * 18 dollar/ 1 item = $450
Ans: A) The total revenue is $450
Answer:
Orbital motion occurs whenever an object is moving forward and at the same time is pulled by gravity toward another object. ... The result is a circular or oval path called an orbit, in which one object keeps moving around the other. Because of the relatively great gravity of the sun, Earth orbits the sun
Answer:
Lithium has two naturally occurring isotopes. Lithium-6 has an atomic mass of 6.015 amu. Lithium-7 has an atomic mass of 7.016 amu. The average atomic mass of lithium is 6.941 amu.
Explanation:
