Chemistry 20 - Unit 4 - Chemistry 20 - Unit 4 - Introduction to Introduction to Stoichiometry Stoichiometry Name: ______Name: ______

1) An acceptable method for the treatment of 1) An acceptable method for the treatment of soluble lead waste is to precipitate the lead as a soluble lead waste is to precipitate the lead as a low solubility lead(II) silicate. low solubility lead(II) silicate. a) Write the net ionic equation for the a) Write the net ionic equation for the reaction of aqueous lead(II) nitrate and reaction of aqueous lead(II) nitrate and aqueous sodium silicate. aqueous sodium silicate.

PbCNOBeapt Nazsiozag 0

pbsiozesyt2NANOzcaoDPKY 2NO 2Na.FIsi025cg 0 pbsioza.it2Nqaggt2N0 a qa gPbYaggtSi0sYagg oPbSi0scs

b) What can we assume about the ambient b) What can we assume about the ambient conditions and the container that likely conditions and the container that likely could be used? could be used?

Probably normal SATP Container is probablyalabwaste container c) Identify the spectator ions in this reaction. c) Identify the spectator ions in this reaction.

Nat and N Gop 05Cag

2) In a hard water analysis, sodium oxalate solution 2) In a hard water analysis, sodium oxalate solution reacts with calcium hydrogen carbonate present reacts with calcium hydrogen carbonate present in the hard water to precipitate a calcium in the hard water to precipitate a calcium compound. Write the net ionic equation for this compound. Write the net ionic equation for this reaction. reaction.

NazOOCCoocaq1 Ca HCGuaq CaOOCC0Qj2NaHCO3a

2N 100600GtcaYaoptLHJCO ocaooeo.Qs52NXJ q eaq 2HC.gg

O0CCOOEaq tCaffee 8 CaOOCCOOcs

3) Write a net ionic equation for the reaction of 3) Write a net ionic equation for the reaction of vinegar (acetic acid solution) with a scale deposit vinegar (acetic acid solution) with a scale deposit in a kettle (assume solid calcium hydroxide). in a kettle (assume solid calcium hydroxide).

CalotDacs 241400Hag 1 0CaKtbc00724,2HOHee COO 2GHz Haq t CalaDus Caat244300 t 2420g Cag Cag

tweak acids can'tdissociate

quantitatively

nuetralization This is a reaction

4) Bromine is a disinfectant commonly used in 4) Bromine is a disinfectant commonly used in swimming pools. One industrial method of swimming pools. One industrial method of producing bromine is to react sea water, producing bromine is to react sea water, containing sodium bromide, with chlorine gas. containing sodium bromide, with chlorine gas. Write the net ionic equation for this reaction. Write the net ionic equation for this reaction.

2Nabrupt Clagg Brzeg 02Nadapt

2Na 2BriaggtClagg o2N 1 aq128 Bragg

2BriagstClagg0242g Bragg