Sample-Scheme-for-Unknown5

Sample-Scheme-for-Unknown5 - Need to Know for Unknown 5A/5B...

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Need to Know for Unknown 5A/5B THE AUTHOR DOESN’T TAKE ANY RESPONSIBILITY FOR THE SCHEME!!! Possible Ions i) Cations: Na + , K + , NH 4 + , Ca 2+ , Mg(H 2 O) 6 2+ , Al(H 2 O) 6 3+ ii) Anions: Cl , NO 3 , SO 4 2 , HSO 4 , OH , CO 3 2 , 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; 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 4 2 ) ions. 1
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Sample 5A (PURE SALT) Soluble or Insoluble pH = Possible Ions Existed or Not Description Na + K + NH 4 + Ca 2+ Mg(H 2 O) 6 2+ Al(H 2 O) 6 3+ Cl NO 3 SO 4 2 HSO 4 OH CO 3 2 HCO 3 2
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Soluble or Insoluble pH = Possible Ions
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This note was uploaded on 04/24/2008 for the course CHM 2046L taught by Professor Horvath during the Spring '08 term at University of Florida.

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Sample-Scheme-for-Unknown5 - Need to Know for Unknown 5A/5B...

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