Honors ChemistryNameDate

Lab 8. FORMING AND NAMING IONIC COMPOUNDS EXPERIMENT

Objective- Observe when ionic substance react to form a product? Write the names and formulas for these products. This experiment will provide you with visual examples of many, many ionic compounds and the opportunity to see the precipitates form in small-size samples. The mixing is done in well plate. This simple procedure and the colorful outcomes make formula-writing more directly connected to real chemical reactions.

Introduction: When ionic compounds dissolve in water, they break apart into ions. These ions move about among the water molecules bumping into other ions and molecules in the solution. When two ionic solutions are mixed, several things can happen. In this experiment, you will have an opportunity to mix various ionic compounds in solution. Some ions will stay dissolved and uncombined in solution even when they are mixed with other ions. We call these ions soluble. When many other ions are mixed, the form compounds which appear as cloudy or grainy precipitates. These substances are called insoluble.

Materials

Well plateWhite Paper Index CardToothpicks (broken into 1/2 pieces)

CHEMICALS:

CATIONSANIONS

Cobalt Chloride - CoCl2Sodium Phosphate - Na3PO4

Lead (II) Nitrate - Pb(NO3)2Potassium Hydroxide – KOH

Silver Nitrate - AgNO3Sodium Carbonate - Na2CO3

Nickel (II) Chloride - NiCl2Sodium Sulfate – Na2SO4

Copper (II) Sulfate - CuSO4Potassium Iodide – KI

Strontium Chloride - SrCl2Sodium Oxalate - Na2C2O4

Iron (III) Nitrate - Fe(NO3)3

SAFETY: Wear safety goggles, lab aprons, close-toed shoes and nitrile gloves at all times in the laboratory. Dispose all chemicals from the well plate in the waste container in the hood. Clean your well plate thoroughly before putting it away. Wash your hands thoroughly before leaving the lab.

Prelab: Provide the chemical formulas for the reagent solutions that will provide the cations and some anions. Then, list either the cation or anion (element symbol and charge) where indicated.

Solution: Formula Cation Solution: Formula Anion Cobalt Chloride ______Potassium Iodide ______

Silver Nitrate AgNO3______

Lead (II) NitratePb(NO3)2______

Copper (II) SulfateCuSO4______

Iron (III) Nitrate Fe(NO3)3______

Nickel (II) Chloride______

Strontium Chloride______

PROCEDURE

  1. Obtain a clean dry well plate and place it on a piece of white paper.
  2. Identify the two solutions that you will be mixing in your well plate. (Double check to ensure that you have selected the correct solutions.
  3. In each well, place 3-5 drops of each solution corresponding to the box on the table.
  4. Mix if needed with a toothpick and record your observations on your Data Table A.
  • Record any color change
  • Record if a precipitate forms using “PPT” for precipitate
  • Describe each precipitate as milky, grainy, cloudy, or gelatinous
  • If no reaction occurred, mark the box with “NR” to indicate that no reaction has taken place.
  1. Continue mixing and recording your observations until the entire data table is completed.
  2. Dispose all chemicals from the well plate in the waste container in the hood.
  3. Clean your well plate thoroughly before putting it away.
  4. Wash your hands thoroughly before leaving the lab

Post lab questions:

For the following pairs of ions, write the formula and the STOCK names of the compound that you would expect them to form. For iron, include the common name also. (Note, Stock, systematic, or IUPAC utilizes Roman numerals to indicate the type of ion present. The common naming system uses the Latin root and ic or ous as an ending.)

1. barium and hydroxide

2. cobalt (III) and phosphate

3. iron (II) and sulfate (stock)

iron (II) and sulfate (common)______

5. platinum (II) and bromide ion

6. platinum (II) and carbonate ion

7. platinum (IV) and bromide ion

8. platinum (IV) and carbonate ion

  1. Complete tables B and C. Note, Oxalate is C2O42-

DATA TABLE A Record color, PPT, PPT description, or NR

CATIONS
ANIONS / CoCl2
Co2+ / Pb(NO3)2
Pb2+ / CuSO4
Cu2+ / Fe(NO3)3
Fe3+ / NiCl2
Ni2+ / SrCl2
Sr2+ / AgNO3
Ag+
Na3PO4
PO43-
KOH
OH-
Na2SO4
SO42-
Na2CO3
CO32-
KI
I-
Na2C2O4
C2O42-

ANALYSIS - DATA TABLE B - Write the chemical formulasof the chemical compounds produced in the reactions that formed precipitates in DATA TABLE A.

CATIONS
ANIONS / CoCl2
Co2+ / Pb(NO3)2
Pb2+ / CuSO4
Cu2+ / Fe(NO3)3
Fe3+ / NiCl2
Ni2+ / SrCl2
Sr2+ / AgNO3
Ag+
Na3PO4
PO43-
KOH
OH-
Na2SO4
SO42-
Na2CO3
CO32-
KI
I-
Na2C2O4
C2O42-

DATA TABLE C - Write the STOCK Chemical Names (use Roman Numerals) of the chemical compounds

produced in the reactions that formed precipitates in DATA TABLE A. Also include the common

names also, refer to the following table to help. Mark an X in the box if no precipitate formed indicating that no compound name is needed.

Metal / Ion / STOCK / Common name
Copper / Cu+ / copper(I) ion / cuprous ion
Cu2+ / copper(II) ion / cupric ion
Iron / Fe2+ / iron(II) ion / ferrous ion
Fe3+ / iron(III) ion / ferric ion
Nickel / Ni2+ / nickel(II) ion / nickelous ion
Ni3+ / Nickel(III) ion / nickelic ion
Tin / Sn2+ / tin(II) ion / stannous ion
Sn4+ / tin(IV) ion / stannic ion
Lead / Pb2+ / lead(II) ion / plumbous ion
Pb4+ / lead(IV) ion / plumbic ion
CATIONS
ANIONS / CoCl2
Co2+ / Pb(NO3)2
Pb2+
Na3PO4
PO43-
KOH
OH-
Na2SO4
SO42-
Na2CO3
CO32-
KI
I-
Na2C2O4
C2O42-

Data Table C continued

CATIONS
ANIONS / CuSO4
Cu2+ / Fe(NO3)3
Fe3+
Na3PO4
PO43-
KOH
OH-
Na2SO4
SO42-
Na2CO3
CO32-
KI
I-
Na2C2O4
C2O42-

Data Table C continued

CATIONS
ANIONS / NiCl2
Ni2+ / SrCl2
Sr2+ / AgNO3
Ag+
Na3PO4
PO43-
KOH
OH-
Na2SO4
SO42-
Na2CO3
CO32-
KI
I-
Na2C2O4
C2O42-

Forming and Naming Ionic Compounds Rubric(78pts) Name

___ 1 ptsLab is entered into the Table of Contents

___ 2 ptsLab is entered according to Basic Lab Rubric

___ 12 pts Lab is physically completed within one week of assigned date

___ 6 ptsPreLab: Each blank is worth ½ pt

___ 21 ptsData Table A completely filled out. Each observation block is worth ½ points.

___ 11 ptsData Table B accurately filled in. Each block is worth approx. ¼ pt

___ 21 ptsData Table C accurately filled in. Each block is worth ½ points. Include both stock and common names for lead, copper, iron, and nickel compounds

___ 2 ptsLab is neat and answers are written dark and legible.

___ 2 pts A rubric is included with the lab