Answer the following questions: (Questions about titration) a. Why is it important to keep the NaOH solution covered at all times?
b. How will the molarity of NaOH solution be affected by its continued exposure to the atmosphere?
c. The pale pink color of the titration solution at the end point will fade to colorless after several minutes when exposed to the atmosphere. Account for this color change.
d. What volume (in mL) of 0.293 M Ba(OH)2 is required to neutralize 25.00 mL of 0.200M HNO3?

Following are the solution to the given question:

Explanation:

For question a:

It is prevented that the atmospheric through dissolving in the solution and make carbonic acid which reacts with the

For question b:

For this, the reacts with the dissolved  so, the molarity of the will be decreased.

For question C:

In this, the Phenolphthalein is pink in the basic solution and colorless throughout the acidic solution.

if the solution is exposed  from the atmosphere, the is from the air dissolving in the solution, and making the that gives the

lower pH.

colorless phenolphthalein  

For question D:

Calculating the moles of

Calculating the moles of  

Calculating the volume of

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.