Chm2046L Unknown 5 - vi Start your analysis right away Time...

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Possible Ions i) Cations: Na + , K + , NH 4+ , Ca 2+ , Mg(H 2 O) 62+ , Al(H 2 O) 63+ ii) Anions: Cl , NO 3− , SO 42− , HSO 4− , OH , CO 32− , HCO 3− iii) Possible insoluble compounds: Ca(OH) 2 , CaSO 4 •2H 2 O, CaCO 3 , MgCO 3 , Mg(OH) 2 Procedures for the unknown analysis: i. Prepare the “ Neutral Water ” (Read lab manual Page 2−8); ii. Clean glassware and crucible, etc.; iii. Get some indicators, reagents (using your plastic bottles) and litmus papers that you need use during the unknown analysis; iv. Get a unknown card from the stockroom and fill in the necessary information; v. Bring the card to the stockroom and get two unknown samples;
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Unformatted text preview: vi. Start your analysis right away! Time limitation for two samples (5A/5B) is 120 minutes. The one with label is 5A sample . vii. Return the unknown card to the personnel in the stockroom when you finish it! Notes: 5A (the sample with the numerical label) is a pure salt , which means it only contains two (one cation and one anion) or three ( alums , i.e., two cations and SO 42 − ) ions. 1 Sample 5A (PURE SALT) Soluble or Insoluble pH = Possible Ions Existed or Not Description Na + K + NH 4+ Ca 2+ Mg(H 2 O) 62+ Al(H 2 O) 63+ Cl − NO 3− SO 42− HSO 4− OH − CO 32− HCO 3−...
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Chm2046L Unknown 5 - vi Start your analysis right away Time...

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