2. A water solution has 2.00x10 -5 moles of H + in 2.00 liters A. What is the [H

ID: 920457 • Letter: 2

Question

2. A water solution has 2.00x10-5 moles of H+ in 2.00 liters

A. What is the [H+] in the solution?

B. What is the pH ?

C. What is the [OH-] ions?

D. Is the solution acidic or basic ?

E. What is the pH if water is added to make the volume 20.0 liters?

3. Why are nuclear fusion reactions not presently a practical source of energy on earth ?

4. What is the pressure in atmospheres of 12.5 grams of Cl2 gas in A 855mL container at 25.0oC ?

5. Considering the reaction : 2KClO3 2KCl + 3O2

How many liters of O2 gas are produced at 25.0oC and 0.950 atmospheres pressure when 105 grams of KClO3 react?

I'll answer number 2 and 4 here:

2) A. [H+] = 2x10-5 moles / 2 L = 1x10-5 M

B. pH = -log[H+]

pH = -log(1x10-5) = 5

C. pOH = 14 - pH

pOH = 14 - 5 = 9

D. pH = 5, this means that the solution is acidic (pH < 7).

E. Now the new concentration would be:

[H+] = 2x10-5 / 20 = 1x10-6 M

pH = -log(1x10-6) = 6.

4. use the following equation: PV = nRT ---> P = nRT / V

and n = m/MM so:

P = mRT / MM V

MM of Cl2 = 35.5 * 2 = 71 g/mol

P = 12.5 * 0.082 * 298 / 71 * 0.855

P = 5.03 atm

Question 3 and 5, post them per separate in different questions so I can help faster and better. Hope this helps.

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