In the Vitamin C lab, we prepared a solution of sodium thiosulfate, NaS.0. proce

Question

In the Vitamin C lab, we prepared a solution of sodium thiosulfate, NaS.0. process of determining the quantity of vitamin C in our samples, the with: 6) Ia the Na,S O, reacted A. KIO B. 12 C. VitaminC D. Both 12 and vitamin C ) The tritium nucleus (H) consists of one proton and two neutrons. The mass of a7 tritium nucleus is: A. equal to the mass of the proton plus the mass of the two neutrons B. equal to the mass of the proton only C. more than the mass of the proton plus the mass of the two neutrons D. less than the mass of the proton plus the mass of the two neutrons. 8) 8 What criterion must be met for a reversible reaction to be spontaneous? A. The equilibrium constant must have a negative value. B. The equilibrium constant must be between 0 and 1. C. The equilibrium constant must be greater than 1 D. The equilibrium constant has nothing to do with spontaneity 9) ) The decay constant of carbon-14 is 1.21x10 years. Out of a sample containing 1.00x10 atoms of carbon-14, about how many remain after 10,000 years? A. 298,000 B. 121,000 C. 702,000 D. 250,000 10) Which of the following processes results in a positive change in entropy of the system? the autoionization of water the dissociation of a weak acid in water the melting of ice B. ·the formation of FeS from sulfur and iron.

Explanation / Answer

Ans 6 : d) Both I2 and Vitamin C

Vitamin C is titrated with known volume of iodine solution in an acidic medium which forms a red brown triiodate ion in the solution.

The remaining iodine solution is titrated with sodium thiosulafate solution which produces colourless I- ions.

The difference in the amount of I3- ions generated in both the reactions gives the value of ascorbic acid in the solution.

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