GLY_4200C_HW4_F11_KEY

GLY_4200C_HW4_F11_KEY - 3 ? Solution: Oxygen is -2, so...

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1 GLY 4200C NAME HOMEWORK 4 Ionic Valance in Mineral Formulas Guidelines: In mineral formulas, the following guidelines are useful in determining the valance of an ion. 1. Oxygen ion have a charge of -2 2. Alkali metals ions have a charge of +1 3. Alkaline earth ions have a charge of +2 4. Halogen ions have a charge of -1 5. Sulfur anion has a charge of -2, in sulfide minerals Exception: When sulfur is present as the S 2 dimer, it has a charge of -1 6. Silicon is usually +4 7. Aluminum is usually +3 8. Water molecules are neutral, so there presence in a mineral formula may be ignored Applying these guidelines allows the determination of the unknown valance state of ions in most minerals: Example: What is the charge on Mn in rhodonite, MnSiO
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Unformatted text preview: 3 ? Solution: Oxygen is -2, so three oxygens are -6 Silicon is +4, so SiO 3 is -2 Therefore, Mn is +2 Apply the guidelines to solve the unknown valance state of the minerals on the back side of this sheet. 2 Mineral or group Formula Ion Charge on ion (List sign and numerical charge) 1. Stibnite Sb 2 S 3 Sb +3 2. Cassiterite SnO 2 Sn +4 3. Sulfate group SO 4-2 S +6 4, Carbonate group CO 3 2-C +4 5. Hydroxide group OH-1 H +1 6. Antlerite Cu 3 SO 4 (OH) 4 Cu +2 7. Johannsenite CaMnSi 2 O 6 Mn +2 8. Hemimorphite Zn 4 (Si 2 O 7 )(OH) 2 H 2 O Zn +2 9. Nitratite NaNO 3 N +5 10. Uvarovite Ca 3 Cr 2 Si 3 O 12 Cr +3...
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This note was uploaded on 12/12/2011 for the course GLY 4200c taught by Professor Warburton during the Fall '10 term at FAU.

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GLY_4200C_HW4_F11_KEY - 3 ? Solution: Oxygen is -2, so...

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