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Chapter 16: Q9P (page 391)
Write balanced reactions for the destruction of,by boiling.
The balanced reactions are,
localid="1654771990233"
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Potassium bromate,is a primary standard for the generation of in acidic solution:
localid="1654933210874"
Thelocalid="1654933214917" can be used to analyze many unsaturated organic compounds.wasanalyzed as follows: An unknown was treated with 8 -hydroxyquinoline (oxine) atpH5to precipitate aluminum oxinate, localid="1654933218452" The precipitate was washed, dissolved in warm HCl containing excesslocalid="1654933222732" and treated with 25.00 mLof localid="1654933226652"
The excesslocalid="1654933230592" was reduced with Kl, which was converted intolocalid="1654933235658" Thelocalid="1654933239460" required 8.83 mLof localid="1654933242781" to reach a starch end point. How many milligrams of Al were in the unknown?
Aqueous glycerol solution weighing 100.0m gwas treated with 50.0 mL of 0.083 7 M in 4 MHCIat for15minto oxidize glycerol to formic acid.
Glycerol Formic acid
FM92.095
The excess required 12.11mL of 0.044 8 MFto reach a ferroin end point. Find wt%glycerol in the unknown.
is an anode for lithium batteries. Cobalt is present as a mixture of Co (III) and Co (II). Most preparations also contain inert lithium salts and moisture. To find the stoichiometry, Co was measured by atomic absorption and its average oxidation state was measured by a potentiometric tritration.39 For the titration, 25.00mg of solid were dissolved under in 5. mL containing
in plusto give a clear pink solution:
Unreacted required 3.228 mL of for complete titration.
(a) How many mmol of are contained in 25.00mg of the material?
(b) Atomic absorption found 56.4 wt% Co in the solid. What is the average oxidation state of Co ?
(c) Find y in the formula .
(d) What is the theoretical quotient wt\% Li/wt\% Co in the solid? The observed quotient, after washing away inert lithium salts, wasIs the observed quotient consistent with the average cobalt oxidation state?
Whenof unknown were passed through a Jones reductor, molybdate ion was converted into . The filtrate required 16.43mLof to reach the purple end point.
A blank required 0.04mL. Balance the reaction and find the molarity of Molybdate in the unknown.
Two possible reactions of withto produceandare
Scheme:
Scheme:
(a) Complete the half reactions for both schemes by adding and and write a balanced net equation for each scheme.
(b) Sodium peroxyborate tetrahydrate, produces when dissolved in acid . To decide whether Scheme 1 or 2 Schemeoccurs student at the U.S. Naval academy weighed into a 100mLvolumetric flask added 20mLof and diluted to the mark with . Then they titratedof this solution withuntil the first pale pink color persisted. How may mL ofare required in Scheme 1and 2 Scheme?
(The Scheme 1stoichiometry was observed).
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