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Rates of Chemical Reactions

Experiment 25. Rates of Chemical Reactions. 5 HSO 3 − + 2 IO 3 − → I 2 + 5 SO 4 2− + H 2 O + 3 H +. r = k [HSO 3 − ] m [IO 3 − ] n. GOAL. Find n by method of initial rates.

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Rates of Chemical Reactions

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  1. Experiment 25 Rates of Chemical Reactions

  2. 5 HSO3−+ 2 IO3− → I2+ 5 SO42− + H2O + 3 H+ r = k [HSO3−]m[IO3−]n GOAL Find n by method of initial rates

  3. OBTAIN ~250 ml OF KIO3 (SOLUTION 1) & ~100 ml OF NaHSO3 (SOLUTION 2). THIS IS ENOUGH FOR THE EXPERIMENT – KEEP AT YOUR DESK. • TAKE 5 BEAKERS FROM COMMOM AREA.

  4. USE STOP WATCHES IN YOUR CELL PHONES OR FROM THE COMMON AREA. FAMILARIZE WITH THEM BEFORE USING. • POUR SOLUTION 2 TO 1. SEE “TABLE OF KINETIC RUNS”. START NEW RUNS WHILE WAITING FOR THE OLD ONES. • WATCH CAREFULLY, COLOR CHANGE IS RAPID.

  5. RECORD END TIME AT THE SAME COLOR INTENSITY. • RECORD TIME ELAPSED IN SECOND IN DATA FORM. 1 min = 60 s • ALL WASTE GOES DOWN THE DRAIN. • CLEAN AND RETURN BEAKERS WHEN FINISHED.

  6. CALCULATION GUIDE • TABLE OF KINETIC RUNS [IO3−] and [HSO3−] FROM A TO E

  7. 5 HSO3−+ 2 IO3− → I2+ 5 SO42− + H2O + 3 H+

  8. CALCULATION GUIDE • DATA FORM COMPARE EVERY TWO RUNS EXAMPLES: A & B; B & E

  9. REMINDERS • REPORT IS DUE ON MONDAY • NOTE EXTRA CREDIT • QUIZ AFTER LAB

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