Chemistry II Chapter 10 Test
A 50.00 mL sample of a potassium hydroxide is titrated with a 0.8186 M HCl solution. The titration requires 27.87 mL of the HCl solution to reach the equivalence point. What is the molarity of the KOH solution?
(.8186)(27.87) = (M)(50.00; .4563 M KOH
A student titrates a 20.00 mL sample of a solution of HBr with unknown molarity. The titration requires 20.05 mL of a 0.1819 M solution of NaOH. What is the molarity of the HBr solution?
(M)(20.00) = (.1819)(20.05); .1824 M HBr
What is the pH of a 0.000460 M solution of Ca(OH)2?
-log(4.60 x 10^-4) = 3.337, pH 10.663
Chemical formula: Calcium Hydroxide and Phosphoric Acid
Ca(OH)2 and H3PO4
We said that acids were any chemical that increased ____ in water, and bases were any chemical that increases ____ in water. What definition is this?
H+, OH-, Arrhenius
Give 2 acid-base pairs and each theory that can be applied: NH3 + H2O -> NH4^+1 + OH^-1
H2O (A), OH^-1 (CB) and NH3 (B), NH4^+1 (CA); Arrhenius, Bronsted-Lowry
Chemical formula: Sulfurous Acid and Nitric Acid
H2SO3 and HNO3
Give 2 acid-base pairs and each theory that can be applied: HBr + H2O -> H3O^+1 + Br^-1
HBr (A), Br^-1 (CB) and H2O (B), H3O^+1 (CA); Arrhenius, Bronsted-Lowry
Chemical formula: Perchloric Acid and Aluminum Hydroxide
HClO4 and AL(OH)3
Give 2 acid-base pairs and each theory that can be applied: HI + H2O -> H3O^+1 + I^-1
HI (A), I^-1 (CB) and H2O (B), H3O^+1 (CA); Bronsted-Lowry
Give 2 acid-base pairs and each theory that can be applied: HI + KOH -> KI + H2O
HI (A), KI (CB) and KOH (B), H2O (CA); Bronsted-Lowry
Chemical formula: Ammonia and Hydrobromic Acid
NH3 and HBr
Which of the following solutions would contain the highest concentration of OH- ions if 1 mol of each was dissolved in water: H2SO4, NH4Cl, KNO3, NaOH?
NaOH
Name the acid/base: CH3COOH
acetic acid
Indicate acid, base, or both: Has pH of 3
acid
Indicate acid, base, or both: Reacts with zinc to produce hydrogen
acid
Indicate acid, base, or both: Tastes sour
acid
Indicate acid, base, or both: Turns litmus paper red
acid
Indicate acid, base, or both: Turns pink with phenolphthalein
acid
If the pH is 4.5, give: acid/base, pOH, H+, OH-
acid, pOH 9.5, 3.2 x 10^5 H+, 3.2 x 10^-10 OH-
Name the acid/base: NH3
ammonia
Indicate acid, base, or both: Feels slippery
base
Indicate acid, base, or both: Produced when sodium reacts with water
base
Indicate acid, base, or both: Tastes bitter
base
If there is 8.9 x 10^-5 M OH-, give: acid/base, pH, pOH, H+
base, pH 10, pOH 4, 1.1 x 10^-10 H+
If the pOH is 3.8 give: acid/ base, pH, H+, OH-
base, pH 10.2, 6.3 x 10^-11 H+, 1.6 x 10^-4 OH-
If there is 2.4 x 10^-12 M H+, give: acid/base, pH, pOH, OH-
base, pH 11.6, pOH 2.4, 4.2 x 10^-3 OH-
In addition we learned that substances that shares electrons are ____ and substances that accept ____ are acids. What definition is this?
bases, electron pairs, Lewis
What are the three properties of a base?
bitter taste, slippery feel, change litmus indicator blue
Indicate acid, base, or both: Is a good conductor
both
As the H3O+ ion concentration of a solution increases, what happens to the pH?
decreases
Name the acid/base: HCl
hydrochloric acid
Name the acid/base: HClO
hypochlorous acid
Name the acid/base: Mg(OH)2
magnesium hydroxide
Name the acid/base: HNO2
nitrous acid
Give pH and classification: [OH-] 9.8 x 10^-11
pH 10.01, base
Give pH and classification: 6.0 x 10^-3 M Ba(OH)2
pH 11.78, acidic
Give the pH: Thymol Blue (Orange), Phenolphthalein (Clear), Methyl Red (Red), Phenol Red (Yellow)
pH 2 or pH 3
Give the pH: Methyl Orange (Yellow), Phenolphthalein (Clear), Indigo Carmine (Blue), Bromocresol Green (Green)
pH 5
Give pH and classification: 3.5 x 10^-6 M H3P
pH 5.46, acidic
Give the pH: Methyl Orange (Yellow), Phenol Red (Pink), Bromocresol Green (Blue), Phenolphthalein (Clear)
pH 7
Give pH and classification: [H+] 1.0 x 10^-7
pH 7, neutral
Give pH and classification: [H+] 2.5 x 10^-9
pH 8.61, basic
Give the pH: Methyl Red (Yellow), Phenol Red (Pink), Indigo Carmine (Blue), Thymol Blue (Blue)
pH 9
As 0.1 M HCL is added to 0.1 KOH, what happens to the pH of the basic solution? Does the basicity or the acidity decrease?
pH decrease and basicity decreases
Name the acid/base: KOH
potassium hydroxide
We also learned that substances that transfer _____ are acids and substances that accept them are bases. What definition is this?
protons, Bronsted-Lowry
What is produced by a neutralization reaction?
salt and water
What are the three properties of an acid?
sour taste, change litmus indicator red or pink, reacts with metals (in single displacement) to produce H2 and with hydroxides (bases) in neutralization to produce H2O
Name the acid/base: H2SO4
sulfuric acid
The pH of an aqueous solution of sodium hydroxide is 12.9. What is the molarity of the solution?
10^-1.1 = 0.08 M
Write a balanced chemical reaction for calcium metal in hydrofluoric acid
2HF + Ca -> CaF2 + H2
What is the PH of pure water?
7.0