Testing for Ions Prelab

Water may contain ions. Which of the following is a polyatomic ion that may be found in water?

• Ca²⁺

• Mg²⁺

• CH₃COO^-

• NO₃^-

If magnesium and HCl(aq) react to form H₂(g), and a burning splint placed in the gas produces a popping sound, this is a

• negative test

• positive test

• conclusion

• observation

The result for a positive test for the presence of a dissolved ion may include

• an insoluble precipitate

• a solid that won't dissolve

• all of these

• a colour change

The testing solutions are

• AgNO₃, KCl, BaCl₂

• BaCl_2, KSCN_, AgNO₃

• KCl, Na₂SO₄, Fe(NO₃)₃

Potassium chloride solution is used in this investigation to

• provide a source of potassium ion.

• to provide a source of an ionic compound.

• provide a source of chloride ion.

• provide a test solution for chloride ions.

To test for sulfate ion a solution of ___________ is used.

• silver nitrate

• barium chloride

• postassium thiocyanate

To test for the presence of a chloride ion use a solution of ______________.

• silver nitrate

• barium chloride

• potassium thiocyanate

What is the purpose of the iron (III) nitrate solution?

• A source of nitrate ion.

• A source of iron (II) ion.

• A source of iron (III) ion.

• A source of iron (III) ion to demonstrate a positive test.

Assuming that you complete the entire lab including the analysis and Understanding concepts, how many tables will you need to construct?

• 1

• 2

• 3

• 4

Which of the following is not available to you in the lab?

• safety goggles

• apron

• unknown solutions

• spot plates