Solubility Rules and Net Ionic Equations Mrs. Wilson

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Presentation transcript:

Solubility Rules and Net Ionic Equations Mrs. Wilson Thurs 4-14 and Fri 4-15 Solubility Rules and Net Ionic Equations Mrs. Wilson

Objectives Develop solubility rules to help determine if an ionic compound will be soluble or insoluble in water. Use solubility rules to write dissociation equations and predict if an ionic compound is soluble or insoluble in water. Write total and net ionic equations for double replacement reactions that may or may not form precipitates in water, and predict spectator ions. Homework: Finish Lab question #2; Major Quiz next class over 6.1-6.4; Daily Quiz next class. Lesson 6.3 homework. Answers to the review and homework are online.

Daily Quiz You do not need a calculator.

Lab Question #2 You will know by the end of the period today how to answer question #2. Per group, you will staple all of your labs together – but EACH person will be doing question #2 individually. Each person will select three DIFFERENT reactions from the lab observations. For each reaction, you will write a)  balanced molecular equation with states  balanced total ionic equation with states  balanced net ionic equation with states  if there is no net ionic equation, write the balanced molecular equation and write the balanced total ionic equation, but write “NR” in place of the net ionic equation. Your group’s complete lab packet is due next week, Thursday 4-21.

Ionic Compound Naming/Formula Review Let’s bring back Unit 3…

A. Electrolytes and Dissociation Equations Electrolytes: soluble ionic compounds that dissociate (separate into ions). Insoluble ionic compounds are examples of nonelectrolytes.

Ion formulas and their charges (see ions chart) ALL UPDATE: What you must memorize – Ion formulas and their charges (see ions chart) The following solubility rules – Rule #1 Rule #4

(Ignore the numbers.)

B. Writing Equations Using Solubility Rules Example of a net ionic equation that forms an insoluble precipitate:

An Overview What ions are spectators? What is the formula of the insoluble precipitate? What is the correct name for the precipitate?

Another Example #1 on pg. 11 K3PO4 (aq) + Al(NO3)3 (aq) 

Another Example #2 on pg. 11 BeI2 (aq) + Cu2SO4 (aq) 

Pg. 11 Review #3, 4, 5 Final net ionic equations (or NR’s): #3 #4 #5

Doing the Lab The solubility rules override your results… if the solubility rules say the product is insoluble but you wrote NR (because that’s what you saw…) go with the solubility rules. It’s very possible your results are incorrect because of contamination. PO43- Ag+

Make a Precipitate with a Classmate Each person gets a green card. Get up and find one partner from another table. Write down the formulas of your two ionic compounds. Write the balanced molecular equation. Write the total ionic equation. Write the net ionic equation. Figure out the name of the precipitate (if you have one). Write the formulas (with charges) of the spectator ions.