1. Based on the conductivity of pure water (distilled water), does water exist p
ID: 819698 • Letter: 1
Question
1. Based on the conductivity of pure water (distilled water), does water exist
predominantly as ions or as molecules? ____________ Explain why tap water conducted electricity.
2. NaCl is composed of Na+ and Cl- ions, but dry NaCl crystals did not conduct electricity. Explain why.
3. Based on the conductivity of pure/absolute ethanol, does ethanol exist as molecules or as ions? _________
Based on the conductivity of 0.01 M ethanol (dissolved in water), does ethanol dissociate into ions when it is dissolved in water? _________
4. Based on the conductivity of pure/glacial acetic acid, does acetic acid exist as molecules or as ions? _________
What happens to acetic acid when it is dissolved in water?
5. An _____________________ is an ion that is dissolved in a liquid such as a sports drink, like Gatorade. (See introductory material.)
Most sports drinks contain sugar. Based on your conductivity results, is table sugar (sucrose) an electrolyte? ________
Explain why or why not.
Explanation / Answer
1.Pure water containing no exogenous ions is an excellent insulator, but not even "deionized" water is completely free of ions. Water undergoes auto-ionization in the liquid state, when two water molecules form one hydroxide anion(Oh?) and one hydronium cation (H3O+). Because water is such a good solvent, it almost always has some solute dissolved in it, often a salt. If water has even a tiny amount of such an impurity, then it can conduct electricity far more readily, so tap water conducted electricity.
2.Even in solid state sodium chloride contains ion of sodium (Na+) and chloride (Cl-) ions arranged in a regular pattern. These ions are not very free to move about and their position is more or less fixed. solid these ions are arranged in a lattice and unable to move. On heating sodium chloride melts and it becomes liquid. The ions in liquid are more free to move about. The movement of ions helps to conduct electricity. (Note: for the same reason an aqueous solution of NaCl conducts electricity as NaCl ionizes to give Na+ and Cl- ions)
3.no. ethyl alcohol donot dessociate into C2H5+ and OH-
4.For an electrolyte to conduct, it has to have a way to split into ions and that normally means having some water in there to separate the cations from the anions. Now, glacial acetic acid is about 100% pure acetic acid and as such, has very little water in it.. Acetic acid produces free H3O+ and OH- ions when dissolved in water. These ions allow current to flow through the water. CH3COOH(aq) <--> H+(aq) + CH3COO-(aq) Since acetic acid is a weak acid, it does not form a particularly large concentration of ions, so the water does not become a particularly conductor of electricity.
5. dissolved ions,Table sugar, or sucrose, is a good example of a nonelectrolyte. You can dissolve sugar in water or melt it, but it won't have conductivity. No ions are present to conduct
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