# Question 4.1: The average concentration of chloride ion in seawater is 19....

The average concentration of chloride ion in seawater is $19.353 g Cl^{–}/kg$ solution. The World Health Organization (WHO) recommends that the concentration of $Cl^{–}$ ions in drinking water not exceed 250 ppm $(2.50 × 10² ppm)$. How many times as much chloride ion is there in seawater than in the maximum concentration allowed in drinking water?

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Question: 4.2

## Pipes made of polyvinyl chloride (PVC; Figure 4.5) are widely used in homes and office buildings, though their use is restricted because vinyl chloride (VC) may leach from them. The maximum concentration of vinyl chloride (CH2CHCl) allowed in drinking water in the United States is 0.002 mg ...

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Question: 4.22

## Commercial pharmaceutical agents undergo extensive analysis to establish how long they may be stored without degradation and loss of potency. A candidate drug has the following percent composition from combustion analysis: C, 62.50%; H, 4.20%. The drug is a diprotic acid. A standard tablet c ...

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Question: 4.21

## Wetland soil is blue-gray due to Fe(OH)2(s), whereas well-aerated soils are often orange-red due to the presence of Fe(OH)3(s) (Figure 4.30). Write the balanced equation for the reaction of O2(g) with Fe(OH)2(s) in soil that produces Fe(OH)3(s) in basic solution. ...

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Question: 4.20

## Predict the products of the reaction between zinc metal and aqueous hydrochloric acid. Write balanced molecular and net ionic equations for the reaction. Identify the oxidation and reduction half-reactions. ...

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Question: 4.19

## An aluminum wire is dipped into a solution containing sodium, tin, and copper ions. Which ions will be present in the solution after the reaction is complete? ...

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Question: 4.18

## Iodine is slightly soluble in water and dissolves to make a yellow-brown solution of I2(aq). When colorless Sn^2+(aq) is dissolved in it (Figure 4.28), the solution turns colorless as I2(aq) forms and Sn^2+(aq) is converted into Sn^4+(aq). (a) Is this a redox reaction? (b) Balance the equation that ...

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Question: 4.17

## The reaction of oxygen with hydrazine is used to remove dissolved oxygen gas from aqueous solutions: O2(aq) + N2H4(aq) → 2 H2O(l) + N2(g) and the combustion of hydrazine produces enough energy that the substance is used as a rocket fuel. Identify the species oxidized, the species reduced, the ...

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Question: 4.16

## What is the oxidation number of sulfur in (a) SO2, (b) Na2S, and (c) CaSO4? ...

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Question: 4.15