pH + Calculations
pH + Calculations 2
Misc +Titrations
Molarity 2
Molarity 1
100
What does pH stand for?
Percent Hydrogen
100
What would be the pH of a solution that has a hydrogen concentration of 5.00 x 10-11?
pH = -log[H+] so pH = -log[5.00 x 10-1]
= 10.3 pH
100
When you reach equilibrium, how many moles of acids and bases do you have?
The same amount.
100
How do you calculate Molar Mass?
Add up the atomic masses of the individual element or every element in a compound.
100
What is the value of one mole of anything?
6.02 x 1023
200
What is a stronger acid: something with a pH of 2 or something with a pH of 3
pH of 2
200
What would be the pOH of a solution that has a hydroxide concentration of 5.9x10-1?
pOH = -log[OH-], so pOH = -log[ 5.9x10-1]
= .23 pOH
200
When you have the same amount of moles of acids and bases in a titration, what have you reached?
Equilibrium, equivalence point.
200
How do you convert moles to grams?
Multiply moles by the molar mass of the element/compound you are working with.
200
What is the formula for Molarity?
Molarity = (Moles of solute)/(liters of solution)
300
What is a stronger base, something with a pH of 10 or something with a pH of 11?
pH of 11
300
What would be the H+ concentration of a solution that has a pH of 5.6?
H+ = 10-pH so H+ = 10-5.6
= 2.5 x 10-6
300
.25L of .50M solution of NaOH is needed to neutralize .50L of HCl. What was the concentration of the HCl solution?
(.50M) x (.25L) = 0.125moles of NaOH
At equivalence point, same number of moles of acid and base
0.125moles of HCl/ .50L = .25 Molar HCl
300
What is the molar mass of Fe3(PO4)2
358grams
300
What is stronger: 1Molar HCl or .999999 Molar HCl
1M HCl
400
What would be the OH- concentration of a solution that has a pOH of 10.6?
OH- = 10-pOH so OH- = 10-10.6
= 2.51 x 10-11
400
What would be the OH- concentration of a solution that has a pH of 4.5?
14-4.5 = 9.5. 9.5 is the pOH
OH- = 10-pOH so OH- = 10-9.5
= 3.2 x 10-10
400
.25L of .50M solution of NaOH is needed to neutralize .50L of HCl. What was the mass in grams of the HCl to form the solution of HCl?
(.50M) x (.25L) = 0.125moles of NaOH
At equivalence point, same number of moles of acid and base
0.125moles of HCl
0.125moles of HCl x 36g/mole (molar mass of HCl) = 4.5 grams of HCl
400
What is the molarity of a solution made when 25.0grams of KI is dissolved enough to form .25L of solution?
25g KI/ 166gKI = .15moles KI
.15moles/.25L = .60M KI
400
Who came up with the theory of the mole?
Amadeo Avogadro
500
Come draw an accurate pH scale with two acids things on it, two basic things on it, and water labeled.
500
What would be the pH of a solution that has an OH- concentration of 7.5x10-5?
Kw = H+ x OH- = 10-14
H+ = (10-14) / (7.5x10-5) = 1.3x10-10
pH = -log[1.3 x 10-10]
=9.9
500
What did Fritz Haber invent and how did he do it?
Haber invented Haber process which is a way to create unlimited amounts of ammonia. He achieved this by using a dynamic equilibrium system to take raw Nitrogen and Hydrogen in the atmosphere and force them to combine into ammonia.
500
How many liters of .75M KI can be formed from 112.9g of KI?
112.9g KI/ 166gKI = .680 moles
.75M = (.680Moles)/x = liters
.680Moles/.75M = .91Liters
500
Why do we use moles in chemistry calculations instead of grams?
One mole of anything is the exact same number while mass in grams changes depending on the element/compound