Question

The first reaction will be a reaction of the iodide ion (I-1) with hydrogen peroxide (H2O2) in an acidic solution. This reaction produces a slightly orange solution. In our experiment, we will add some orange food coloring to make this solution more orange.

2 H+ (aq) + 2 I- (aq) + H2O2 (aq) ⟶ I2 (aq) + 2 H2O (l)

The next reaction will be between the iodine and starch

I2 + starch ⟶ I2-starch complex (blue-black)

So, when starch is added to the iodine solution made from the first reaction, the solution will turn black immediately, so it is difficult to find the rate of reaction. In order to be able to time this reaction, you will slow it down with another reaction. Adding ascorbic acid will react with the iodine, reducing the concentration of the iodine available to react with the starch.

C6H8O6 (aq) + I2 (aq) ⟶ 2I- (aq) + C6H6O6 (aq) + 2 H+ (aq)

When the ascorbic acid is used up, the remaining iodine molecules can react with the starch and form the black color. The more ascorbic acid you add, the slower the reaction to form the iodine-starch complex will be.

1. What was your hypothesis?
2. Plot your data as drops of ascorbic acid vs. time.
3. As the concentration of ascorbic acid was increased, did the rate of the formation of the iodine-starch complex increase or decrease? Explain your answer in terms of the chemical reactions involved.
4. Was your hypothesis correct?
5. Make a general rule about the effects of concentration of reactants on reaction rates.
6. For practice, the molecular formula for ascorbic acid is C6H8O6, and you used 6 g in this experiment, calculate the molarity of the ascorbic acid. Now calculate the concentration in moles per drop (assume 1 mL = 20 drops).

Answer 1

Answer:

hello ! i just did this project and received a 100,, so here you are ::

1. I hypothesize that if you continue to add more drops, then the time it takes will continue to increase.

2. A; 9.70 secs, B; 14.63 secs, C; 18.78 secs, D; 28.70 secs, E; 31.45 secs.

3. The formation continued to increased. As more was added, the time it took to reach the full reaction was increased.  

4. Yes.  

5. When the concentration of all the reactants increases, more molecules or ions interact to form new compounds, and the rate of reaction increases. When the concentration of a reactant decreases, there are fewer of that molecule or ion present, and the rate of reaction decreases.

6. 6mL.

Step-by-step explanation:

1. for this one it was simple, they are only asking you what you think will happen to the time if they increase the number of drops. remember to use the "if....then..." format.
2. i recorded the container labeled and the time it took for the solution to turn black.
3. they are asking the same thing that they are for the hypothesis but this time after watching the video you know what actually happens. in this case, the more drops you put in the longer it takes for it to react. write this one down without the if then format.
4. for mine, i got it correct but you can put yours wrong on purpose if youd like.
5. i looked this one up, but it makes sense.
6. this is correct, so dont worry.

like i said,, i go this correct so dw ! <3

Answer 2

The rate of reaction depends on the slow step of a reaction.

A hypothesis is a tentative explanation of an observation. This question refers to an experiment so I will try to explain as much as possible. We can see that the rate of reaction is determined by the concentration of the ascorbic acid.

Hence, we can assert that, the more the concentration of the ascorbic acid, the lower the rate of reaction. The rate of reaction depends on the slow step of a reaction.

We know that the molar mass of ascorbic acid is 176 g/mol. The mass of ascorbic acid is  6 g. Hence;

Number of moles of ascorbic acid = 6 g/176 g/mol = 0.034 moles

concentration of ascorbic acid = 0.034 moles/20 × 1 × 10-3 = 1.7 M

Learn more about ascorbic acid: https://brainly.com/question/24809886