Answer Happy

If the advertised Vitamin C (ascorbic acid) content is 0.4 g/L (converted from 80mg per 200mL), what is this concentration in mol/L? (Hint: you have a concentration in mass(g) per litre and you want the concentration in moles per litre. You know the equation which converts from mass to moles - n = m/M. From an earlier question, Mascorbic acid = 176.14 g/mol.) *This is an important final concentration as you will be able to compare this advertised value to the concentration in mol/L that you calculate from your titrations. The advertised value may turn out not to be correct! O c-7.05 x 10-2 mol/L O c = 2.27 mol/L O c = 2.27 x 103 mol/L c = 70.46 mol/L

After multiple titration runs (each with a 25.00mL sample of the standard ascorbic acid solution), the average titre value for the volume of iodine solution dispensed from the burette is 25.04mL (Vtitre). Given the number of moles (n) of 12 that is required for reaction is 1.25 x 10-4 (determined in the previous question), calculate the concentration (c) of the iodine solution in mol/L. Give your answer in digits using scientific notation to two decimal places and do not include the units. For example, if your answer is a concentration of 7.77 x 10-4 mol/L, record this as 7.77 x 10-4. Note that a lower case letter "x" is sufficient to use as a multiplication symbol for this question.

The apple juice you are now about to titrate against your standardised iodine solution has an advertised Vitamin C (ascorbic acid) content of 80mg per 200mL. mg is the symbol for milligrams and there are 1000mg in a g. mL is the symbol for millilitres and there are 1000mL in a L. Using this information, convert the advertised ascorbic acid content of the apple juice of 80mg per 200mL into grams per litre (g/L). O 0.4 g/L 400 g/L 0.016 g/L 16 g/L

You have just calculated that the number of moles of ascorbic acid (Vitamin C) in a 25.00mL aliquot of 0.005mol/L solution is 1.25 x 10-4. Using the balanced equation below, how many moles of iodine, 12, are required to react with 1.25 x 10-4 moles of ascorbic acid, C6H₂O6? C6H8O6 + 12 C6H6O6+21 + 2H+ Write your answer as a digit (in the same scientific notation as the number of moles of ascorbic acid above, if required) and do not include units. (Note: there is no superscript function so if, for example, your answer is 7.7 x 10³ it should be written as 7.7 x 10-3. Note that a lower case letter "x" is sufficient to use as a multiplication symbol for this question.)