Posted by Lucinda on Saturday, August 28, 2010 at 9:29pm.
1. What is the amount of oxalate in 2 mL of 0.035M solution?
a) 7 ¡Á 10¨C2 mole
b) 1.75 ¡Á 10¨C2 mole
c) 7 ¡Á 10¨C5 mole
d) 1.75 ¡Á 10¨C5 mole
2. Sodium oxalate may be prepared by titrating oxalic acid (C2H2O4) with
sodium hydroxide, according to the equation:
C2H2O4(aq) + 2NaOH(aq) ¡ú Na2C2O4(aq) + 2H2O(l)
If the titration of 2 mL oxalic acid with 0.05M NaOH requires 4.3 mL of
titrant, what is the concentration of C2H2O4(aq)?
3. The concentration of FeSO4.7H2O (MW = 278.0) is 300 g L¨C1. What is the
concentration in mol L¨C1?
4. What are the oxidation numbers of sodium and chlorine in NaCl?
a) 0 0
b) +1 +1
c) +1 ¨C1
d) ¨C1 ¨C1
5. What is the indicator in the titration of hypochlorite with thiosulfate?
- CHEMISTRY> HELP QUICK! pls - Anonymous, Wednesday, August 22, 2012 at 4:56am
5 = a
- CHEMISTRY> HELP QUICK! pls - Anonymous, Wednesday, August 22, 2012 at 4:57am
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