Lab 7 Chemicals in everyday life Concepts –Positive test A test that deteemines a type of reaction based on a positive result. –Can not detrmine based.

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Presentation transcript:

Lab 7 Chemicals in everyday life Concepts –Positive test A test that deteemines a type of reaction based on a positive result. –Can not detrmine based on a negative result

Part A 1. NH 3 + H 2 O NH 4 + OH - Positive tests for NH 3 Warning! Ammonia is caustic

Part A 1. Read prcoedures for part A and fill out 1 –6 pg 73 Positive tests for NH 3 Warning! Ammonia is caustic Ammonium salts decompose to ammonia when there is a strong base

Part B 1. CO H + CO 2 + H 2 O Positive tests for baking soda (NaHCO 3 ) austic Carbonates react with acids to produce carbon dioxide

Part B 1.CO 2 + BaOH BaCO 3 (s) + H 2 O 2.Read prcoedures for part B and fill out 7-9 pg 73 Positive tests for carbon dioxide carbon dioxide and barium Hydroxide produces a white precipitate

Part C 1.Cl H 2 SO 4 2HCl (g) + SO Cl AgNO 3 NO 3 + AgCl (s) Positive tests for sodium Chloride 1. All Cl salts react with sulfuric acid (H 2 SO 4 ) to produce HCl (g) 1. All Cl salts react with silver nitarte (AgNO 3 ) to produce AgCl (s)

Part C Read procedures for part C on pg 69 and fill out 10-14pg 73 Skip question and procedures for #15 Warning H 2 SO 4 causes severe burns Positive tests for sodium Chloride

Part D 1.SO BaCl 2 BaSO 4(S) + Cl - Positive tests for Epson salt (MgSO 4 ) 1. SO 4 ion reacts with Barium chloride (BaCl 2 ) to produce Barium sulfate BaSO 4 (S) Read procedures for part D on pg 70 and fill out 16-17on pg 73

Part E (bleach) Positive tests for Iodide Salts NaOCl 4 ion (bleach) reacts with iodine salts to form iodine (Cl 2 ) (aq) + 2I- (I 2 ) (aq) + 2Cl - iodine salts react with AgNO 3 to form silver iodide (s) ) AgNO 3 aq) + I- (AgI) (s) + NO 3

Part E (bleach) Positive tests for Iodide Salts Read procedures for part E on pg and fill out pg 73 Warning H 2 SO 4 causes severe burns Bleach is caustic

Part F (Unknowns) Determine the type of ion your is unknown is based on the results of a positive test with H 2 So 4 Unknown -SO 4 2- CO 3 2- Cl -, I - see table 7-1 on page 71 read procedures for part f on pg 71 and compare results with table 7.1 Warning H 2 SO 4 causes severe burns

Due next week Pgs 73 – 74 omit page 75 Pre Quiz on lab 8