Chemistry Final

pure water at 25\* C has a PH of

4. 7

How many milliliters of 0.5 M NaOH are needed to exactly neutralize 40. Milliliters of 2.0 M HCL ?

1. 16 ML

As HF dissolves in water, the following ionization reaction occurs: this reaction, a proton is donated to

1. H2O by HF

What is the concentration of H3O+ ions, in moles per liter, of a 0.0001 M HCl solution?

3. 1 x 10-4

Given the neutralization reaction: which compound is a salt?

2. K2SO4

If 50. milliliters of a 1.0 M NaOH solution is needed to exactly neutralize 10. milliliters of an HCl solution, the molarity of the HCl solution is

3. 5.0 M

Household vinegar has a pH of approximately 3.0. Which would appear yellow when added to a vinegar solution?

1. Bromcresol green

Which formula represents a conjugate acid- base pair?

3. CH3COOH and CH3COO-

The results of testing a colorless solution with three indicators are shown in the table below. Which formula could represent the solution tested?

2. NaOH (aq)

An aqueous solution of an ionic compound turns red litmus blue, conducts electricity, and reacts with an acid to form a salt and water. This compound could be

3. LiOH

What type of reaction is represented by the following equation? Al2S3 + 6H2O ——- 2Al(OH)3 + 3H2S

3. Hydrolysis

Which compound reacts with an acid to form a salt and water?

3. KOH

According to the Arrhenius theory, the acidic property of an aqueous solution is due to an excess of

1. H+

According to the Arrhenius theory, which list of compounds includes only bases?

4. KOH, NaOH, and LiOH

Which substance can act as an Arrhenius acid in aqueous solution?

3. HI

If a solution has a hydronium ion concentration of 1 x 10-9 M, the solution is

3. Basic and has a PH of 9

What is the conjugate base of NH3?

3. NH2-

Which pH value indicates the most basic solution?

4. 11

Which concentration indicates a basic solution at 298 K?

4. \[OH-\] > 1.0 x 10-7

A 0.1 M solution of HCl contains

3. more H3O+ ions than OH- ions

An indicator was used to test a water solution with a pH of 12. Which indicator color would be observed?

1. pink with phenolphthalein

As a solution of NaOH is diluted from 0.1 M to 0.001 M, the pH of the solution

1. Decreases

When an acid solution exactly neutralizes a base solution, what acid-base combination always produces a mixture with a pH less than 7?

3. A strong acid and a weak base

According to the Bronsted-Lowry theory, H2O is considered to be a base when it

1. Donates a proton

When the salt Na2CO3 undergoes hydrolysis, the resulting solution will be

2. Basic with a PH greater than 7

Based on the equation, HX would be classified as

3. an acid, because it donates a proton

Which of the following statements best describes a solution with a pH of 3?

1. It has an H3O+ ion concentration of 1 x 10-3 mol/L and is acidic

Which 0.1 M solution has a pH greater than 7?

2. KOH

As the H3O+ ion concentration of a solution increases, the pH of the solution

1. Decreases

Which salt hydrolyzes in water to form a solution that is acidic?

4. NH4Cl

Which solutions contain electrolytes?

Solution A, C, and D

Which solution has the lowest PH?

Solution D

Which solutionh a s a solute that is classitied as a salt?

Solution A

Which solution is most likely to react with an acid to form salt and water?

Solution C

Which solution has the lowest freezing point?

Soution C has the lowest freezing point

State, in terms of the phi scale, why this beverage is classified as acidic.

It has a PH less than 7.0

Using Table M, identity oneindicator that is yellow in a solution that has the same phi value as this beverage.

Bromcresol green has the same PH value as the beverege

After the beverage bottle is left open for several hours, the hydronium ion concentration in the beverage solution decreases to 1/1000ofthe original concentration. Determine the new phi of the beverage solution.

The new PH is 6

What color change does the phenolphthalein undergoduring this titration?

The color changes from colorless to pink

What is the molarity of the HNO3?

0\.21 m is the molarity

Calculate the molarity of the KOH.

The molarity of KOH is 0.97M

Why is it better touse several trials of a titration rather than one trial to determine the concentration of a solution of unknown concentration?

Running several trials rather than one will increase the reliability

Determine both the total volume of HCL(aq) and the total volume of NaOH(aq).

The total volume is 3.8 ml

What is the molarity of the NaOr solution?

The molartiy is 0.25 m

Identity a possible ph value for the rainwater.

4\.4 - 5.5

Explain, in terms of hydronium ions and hydroxide

The ph of rainwater is less than 7.0 due to the concentration of hydronium

If the rainwater were tested with Bromthymol Blue, what color would be observed?

Yellow

The volumeo f the NaOH(a)solution is expressed to what number of significant figures?

Its expressed as three figures

Completethe equation for thisneutralization reaction by writing the formula of each product in thespaces below.

HNO3 (aq) + NaON(aq) —— H20(l) + NaNO3(aq)

Show acorrect numerical setup for calculating the concentration ofthe HNO-(aq) solution.

(35.O ML)=(0.15m)(30.0ml)

Determine the total volume of NaOH(a) added when the reaction mixture has a pH value of 7.0.

25\.0 ml

Write a balanced equation that represents this neutralization reaction.

HCL(aq)+NaOH(aq) ——- H20(l)+NaCL(aq)

In another trial, 40.0 milliliters ofHC1(ag) is completely neutralized by 20.0 milliliters of this 0.10 MNaOH(a). Calculate the molarity of the titrated acid in this trial.

0\.05 m