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Chapter 4: Q4.13P (page 178)

Question:State whether an aqueous solution of each of the following substances conducts an electric current. Explain your reasoning.

(a) Potassium sulfate (b) Sucrose,C12H22O11

Short Answer

Expert verified

Answer

a) Yes, an aqueous solution of Potassium sulfate conducts an electric current.

b) No, an aqueous solution of Sucrose,C12H22O11 does not conduct an electric current.

Step by step solution

01

Explain the solubility of ionic compounds in aqueous solution

Those compounds which give ions on dissolving in water can conduct electric current in their aqueous solution.

02

Determine aqueous solution of given compounds conduct electricity or not

In the case of Potassium sulfate: It is an ionic compound and dissociates into its ions as K+and SO42- through which their aqueous solution conducts electric current.

In the case of Sucrose,C12H22O11It is a covalent compound and does not dissociate into ions even though it is soluble in water.

Hence, it is known as non-electrolyte and its aqueous solution does not conduct an electric current.

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Most popular questions from this chapter

Magnesium is used in lightweight alloys for airplane bodies and other structures. The metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and electrolysis. How many kilograms of magnesium can be obtained from 1.00 km3 of seawater if the initial Mg2+ concentration is 0.13% by mass (dof seawater = 1.04 g/mL)?

Question: In 1997, at the United Nations Conference on Climate Change, the major industrial nations agreed to expand their research efforts to develop renewable sources of carbon-based fuels. For more than a decade, Brazil has been engaged in a program to replace gasoline with ethanol derived from the root crop manioc (cassava).

(a) Write separate balanced equations for the complete combustion of ethanol (C2H5OH) and of gasoline (represented by the formula C8H18).

(b) What mass of oxygen is required to burn completely 1.00 L of a mixture that is 90.0% gasoline (d =0.742 g/mL) and 10.0% ethanol (d= 0.789 g/mL) by volume?

(c) If 1.00 mol of O2 occupies 22.4 L, what volume of O2 is needed to burn 1.00 L of the mixture?

(d) Air is 20.9% O2 by volume. What volume of air is needed to burn 1.00 L of the mixture?

A mixture of KClO3 and KCl with a mass of 0.950 g was heated to produce O2. After heating, the mass of residue was 0.700g. Assuming all the KClO3 decomposed to KCl and O2, calculate the mass percent of KClO3 in the original mixture.

In which of the following equations does sulfuric acid act as an oxidizing agent? In which does it act as an acid? Explain.

(a)4H+(aq)+SO42-(aq)+2NaI(s)→2Na+(aq)+I2(s)+SO2(g)+2H2O(l)(b)BaF2(s)+2H+(aq)+SO42-(aq)→2HF(aq)+BaSO4(s)

Question: Over time, as their free fatty acid (FFA) content increases, edible fats and oils become rancid. To measure rancidity, the fat or oil is dissolved in ethanol, and any FFA present is titrated with KOH dissolved in ethanol. In a series of tests on olive oil, a stock solution of 0.050 M ethanolic KOH was prepared at 250C , stored at 0oC, and then placed in a 100-mL buret to titrate any oleic acid CH3CH27CH=CHCH27COOHpresent in the oil. Each of four 10.00-g samples of oil took several minutes to titrate: the first required 19.60 mL, the second 19.80 mL, and the third and fourth 20.00 mL of the ethanolic KOH.

(a) What is the apparent acidity of each sample, in terms of mass % of oleic acid? (Note: As the ethanolic KOH warms in the buret, its volume increases by a factor of .)

(b) Is the variation in acidity a random or systematic error? Explain.

(c) What is the actual acidity? How would you demonstrate this?
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