# Question 4.11: Diluting a Solution You are given a solution of 14.8 M NH3. ...

Diluting a Solution

You are given a solution of 14.8 $M NH_3$. How many milliliters of this solution do you require to give 100.0 mL of 1.00 $M NH_3$ when diluted (Figure 4.21)?

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Question: 4.9

## Calculating Molarity from Mass and Volume A sample of NaNO3 weighing 0.38 g is placed in a 50.0-mL volumetric flask. The flask is then filled with water to the mark on the neck, dissolving the solid. What is the molarity of the resulting solution? PROBLEM STRATEGY To calculate the molarity, you ...

You find that 0.38 g NaNO_3  is   4.\underl...
Question: 4.3

## Deciding Whether Precipitation Occurs For each of the following, decide whether a precipitation reaction occurs. If it does, write the balanced molecular equation, and then the net ionic equation. If no reaction occurs, write the compounds followed by an arrow and then NR (no reaction). a. Aqueous ...

a. The formulas of the compounds are NaCl and [lat...
Question: 4.2

## Writing Net Ionic Equations Write a net ionic equation for each of the following molecular equations. a. 2HClO4(aq) + Ca(OH)2(aq) → Ca(ClO4)2(aq) + 2H2O(l ) Perchloric acid, HClO4, is a strong electrolyte, forming H^+ and ClO4^- ions in solution. Ca(ClO4)2 is a soluble ionic compound. b. ...

a. According to the solubility rules presented in ...
Question: 4.14

## Calculating the Quantity of Substance in a Titrated Solution A flask contains a solution with an unknown amount of HCl. This solution is titrated with 0.207 M NaOH. It takes 4.47 mL NaOH to complete the reaction. What is the mass of the HCl? PROBLEM STRATEGY You convert the volume of NaOH (4.47 × ...

The calculation is as follows: 4.47  \times...
Question: 4.13

## Calculating the Volume of Reactant Solution Needed Consider the reaction of sulfuric acid, H2SO4, with sodium hydroxide, NaOH. H2SO4(aq) + 2NaOH(aq) → 2H2O(l) + Na2SO4(aq) Suppose a beaker contains 35.0 mL of 0.175 M H2SO4. How many milliliters of 0.250 M NaOH must be added to react completely with ...

The calculation is as follows: 35.0  \times...
Question: 4.12

## Determining the Amount of a Species by Gravimetric Analysis A 1.000-L sample of polluted water was analyzed for lead(II) ion, Pb^2+, by adding an excess of sodium sulfate to it. The mass of lead(II) sulfate that precipitated was 229.8 mg. What is the mass of lead in a liter of the water? Give the ...

Following Example 3.7, you obtain the mass percent...
Question: 4.10

## Using Molarity as a Conversion Factor An experiment calls for the addition to a reaction vessel of 0.184 g of sodium hydroxide, NaOH, in aqueous solution. How many milliliters of 0.150 M NaOH should be added? PROBLEM STRATEGY You first need to convert grams NaOH to moles NaOH, because molarity ...

Here is the calculation. (The molar mass of NaOH i...
Question: 4.1

## Using the Solubility Rules Determine whether the following compounds are soluble or insoluble in water. a. Hg2Cl2 b. KI c. lead(II) nitrate PROBLEM STRATEGY You should refer to Table 4.1 for the solubility rules of ionic compounds to see which compounds are soluble in water. The soluble ionic ...

a. According to Rule 3 in Table 4.1, most compound...
Question: 4.8

## Balancing Simple Oxidation–Reduction Reactions by the Half-Reaction Method Consider a more difficult problem, the combination (oxidation–reduction) reaction of magnesium metal and nitrogen gas:Mg(s) + N2(g) → Mg3N2(s) Apply the half-reaction method to balance this equation. PROBLEM STRATEGY Start ...

Identify the oxidation states of the elements: [la...
Question: 4.5