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Lab 7 Chemicals in everyday life

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

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Lab 7 Chemicals in everyday life

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  1. Lab 7Chemicals 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

  2. Part A • Positive tests for NH3 • Warning! Ammonia is caustic 1. NH3+ H2ONH4+ OH-

  3. Part A • Positive tests for NH3 • Warning! Ammonia is caustic • Ammonium salts decompose to ammonia when there is a strong base 1. Read prcoedures for part A and fill out 1 –6 pg 73

  4. Part B • Positive tests for baking soda (NaHCO3) austic • Carbonates react with acids to produce carbon dioxide 1. CO3-2 + H+ CO2 + H2O

  5. Part B • Positive tests for carbon dioxide • carbon dioxide and barium Hydroxide produces a white precipitate • CO2 + BaOHBaCO3 (s)+ H2O • Read prcoedures for part B and fill out 7-9 pg 73

  6. Part C • Positive tests for sodium Chloride • 1. All Cl salts react with sulfuric acid (H2SO4) to produce HCl (g) • 1. All Cl salts react with silver nitarte (AgNO3) to produce AgCl (s) • Cl-2+ H2SO42HCl(g) + SO4-2 • Cl-2+ AgNO3NO3 + AgCl (s)

  7. Part C • Positive tests for sodium Chloride • Read procedures for part C on pg 69 and fill out 10-14pg 73 • Skip question and procedures for #15 • Warning H2SO4 causes severe burns

  8. Part D • Positive tests for Epson salt (MgSO4) • 1. SO4 ion reacts with Barium chloride (BaCl2) to produce Barium sulfate BaSO4 (S) • SO4-2+ BaCl2BaSO4(S) + Cl- • Read procedures for part D on pg 70 and fill out 16-17on pg 73

  9. Part E (bleach) • Positive tests for Iodide Salts NaOCl4 ion (bleach) reacts with iodine salts to form iodine (Cl2)(aq) +2I- (I2)(aq) + 2Cl- iodine salts react with AgNO3 to form silver iodide (s)) AgNO3 aq) +I- (AgI)(s) + NO3

  10. Part E (bleach) • Positive tests for Iodide Salts • Read procedures for part E on pg 70-71 and fill out 18-19 pg 73 • Warning H2SO4 causes severe burns • Bleach is caustic

  11. Part F (Unknowns) • Determine the type of ion your is unknown is based on the results of a positive test with H2So4 • Unknown -SO42-CO3 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 H2SO4 causes severe burns

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

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