The Reaction That Made Me Love Chemistry

Here’s my lab report:

Fatima Gaye
Che 121 – Preparation of Solutions: The Briggs-Rauscher Reaction lab report

06 October 2017

Solution 1: To find the amount of solute needed to create 50mL of 0.15M malonic acid (CH2(COOH)2) and 0.020 M Manganese sulfate monohydrate (MnSO4H2O) was calculated by using the formula:
G = (V (in liters) x molV) x gmol.
The calculation for the malonic acid: (0.05 L x0.15 M1 L)x104 g1 mol= 0.78 g CH2(COOH)2.
The calculation for the MnSO4H2O: (0.05 L x 0.020 M1 L) x 169 g1 mol= 0.169 g MnSO4H2O.

0.785 g of malonic acid, and 0.169 g of Manganese sulfate monohydrate were weighed, and both powders were transferred into a 50 mL volumetric flask filled halfway with distilled water. The flask was sealed and the solution was inverted about 8 times (to dissolve the solids) and labeled.
Solution 2: The amount of 0.20 M potassium iodate (KIO3) needed to prepare a 50.0 mL solution was calculated using the formula:
G = (V (in liters) x molV) x gmol.
The calculation for KIO3: (0.05 L x 0.20 mol1 L)x 214 g1 mol= 2.14 g KIO3

The dilution of 1.0 M H2SO4 to create 50.0 mL of 0.080 M H2SO4 was calculated using the formula:
(concentration 1)(volume 1 in liters) = (concentration 2)(volume 2 in liters)
The calculation for H2SO4: (1.0 M H2SO4)(x) = (0.080 M H2SO4)(0.05 L)
1.0(x)1.0 = 0.0041.0= 0.004 L = 4 mL of H2SO4

2.140 g of KIO3 was weighed, and 30 ml of distilled water was added into a 250 mL beaker along with the potassium iodate. Since potassium iodate is not very soluble at room temperature, the beaker was heated and stirred with a magnetic stirrer on a hot plate on a low medium setting. Once the KIO3 was dissolved in the solution, the beaker was allowed to cool down and transferred into a 50 mL volumetric flask. 4 ml of H2SO4 was also added to the flask which was covered with a lid, and inverted about 7 times and labeled.
To create solution 3: The volume of 30.0% Hydrogen Peroxide (H2O2) needed to prepare 50.0 mL of 3.6 M H2O2 was calculated using the formula :
M = nv (L), the result was in grams, so to calculate the final volume, the density of H2O2 (1.11 g/ml) was then plugged into D=mv
Calculations for H2O2 : 3.6 M =34 g H2O20.05 L= 6.12 g of H2O2

6.12 g x 100 g30 g= 20.4 g H2O2

1.11 g/mL =20.4 gv= 18. 4 mL ≊18 mL H2O2
20 ml of distilled water was added to a 50.0 mL volumetric flask. Because of the unstable nature of H2O2, the 18 mL solution was pre measured and dispensed into the volumetric flask. Distilled water was then added until the water level reached the etched mark on the flask. The flask was then closed and inverted about 6 times and labeled.
The Briggs-Rauscher reaction was demonstrated by adding 4 drops of 3% starch solution in a 150 mL beaker.10 mL of solution 1, 2, and 3 were measured in 3 individual graduated cylinders. Solution 1 was added first, then solutions 2 and 3 were added simultaneously and swirled. The clear solution began turning an amber color, and moments later turned a dark blue color, there was a flash of an indigo/purple color before it oscillated back to the previous amber color. The first cycle observed went from blue to blue in 11:56 seconds. What appeared to be tiny gas bubbles were observed in the liquid.
The possible reactions taking place simultaneously in the Briggs-Rauscher reactions are as follows:
H2O2 (aq)+ I2 (s)⇾ 2H+1 (aq)+ 2I -1 (aq) + O2 (g)
2IO3-1(aq) + 12H+1 (aq) + 5 Mn+2 (aq) ⇾ I2 + 6H2O+ + 5Mn+4
The equation 5H2O2 (aq) + 2IO3- (aq) + 2H+ (aq) + starch ⇾ 5O2(g) + starch-I2 + 6H2O(aq) explains how the amber color appears from the colorless solution. The equation
I2 (aq) + I- (aq) ⇾ I3- explains how the dark blue solution is produced and becomes colorless from the dark blue color. The equation 5H2O2 (aq) + 2IO3- (aq) + 2H+ (aq) + starch ⇾ 5O2(g) + starch-I2 + 6H2O(aq) explains the bubbles that were observed. The equations H2O2 (aq)+ I2 (s)⇾ 2H+1 (aq)+ 2I -1 (aq) + O2 (g) and Starch-I2 (aq) + CH2(COOH)2 (aq) ⇾ ICH(COOH)2 (aq) + I- (aq) + Starch explains why the reaction does not last forever.
The second trial was timed in 7 cycles, from blue to blue. The cycle times were 13.56 seconds, 14.79 seconds, 14.94 seconds, 16.86 seconds, 17.49 seconds, 18.97 seconds, and 20.20 seconds respectively. The length of the cycles changed over time as the cycles went from blue to blue at a slower rate. Once the cycle was placed on a magnetic stirring bar, the cycle times went from 21.52 seconds, 21.06 seconds, 20.87 seconds, 29.23 seconds, 27.20 seconds, 22.82 seconds, 27.20 seconds, and 22.82 seconds respectively. It seemed that the cycle happened a little slower on the magnetic stirrer. I believe that this happened because the chemicals, I2 in particular, is being consumed at a faster rate than it is being created while on the magnetic stirrer, making the color change happen at a much slower rate making the solution clear up.


God, I hope he doesn’t see this because I love you Dexter… but… when a 29 year old man is telling me that he’s going back to school for music… I’m gonna have some questions on what you’re doing in life.

He seems pretty happy though. He’s thanking me for being an inspiration to him. I’m just happy that he’s happy.

Dexter is a very attractive man with a rather large penis… but if he doesn’t get his shit together, that will all go to waste.

He also has a receding hairline. Lmao, I’m into balding men.

He seems to be getting his act together. He used to be really sheltered and not social. Now we’re talking… all day actually. He’s seemed to have changed a little. This is exciting for me.

So Dexter is my longest fuck buddy. We’ve been hooking up for about for 4 years now… off and on. I’ve known him for about 10 years. We’ve never lost contact. We’re basically really good friends.

Sex is somewhat uncomfortable with him. He is not allowed to be on top of me. Doggy style is not allowed either. Cowgirl & reverse cowgirl are the only positions we could do. After having sex with him, I’d be sore for a week.

When I say that he has a large penis… I mean it. It’s not only girthy, but there’s length. If there’s ever been a pornstar penis, his is it.

We will probably have sex again sometime in the future.

He said that he is now working out and eating healthy. He was getting a little fat the last time I saw him. But if he tightens that bod up, he’d be a perfect catch.

He is very intelligent. I remember one time gawking at his brilliance. He also loves Radiohead.

There’s a picture of his penis somewhere on my hard drive that I will look at on occasion when I wanna see a thick dick. Haha. That cock is like 9-10 inches with a 4.5 inch circumference. I’m not even exaggerating.

But I am glad he is happy! (I’ll be happier when I’m riding that.)

We’re planning on taking vacation together, I guess. The week after the 4th. He wants to go hiking in lake George. 😉

I just really want to sit on his cock. But we’ll see.

Dexter is a little flaky, so I’m scared to put my eggs in his basket.

The last time we had sex, we didn’t use protection. He came inside me. I was scared and I took a plan B (because I’m very fertile.).

I wasn’t mad, in fact I kinda drove the situation to happen. I know that if any man gets into my vagina unprotected, they will cum inside me. There’s no if ands or buts about it. I just know.

But I’m not planning on getting pregnant on this vacation, so I might start taking birth control. I’m at the point where it would work if I took it now.

Anyway, we will see. I’m happy to finally see him.

We plan on covering “Duality” by Slipknot. Hehe.

I Walked

Miles last night. Miles away from a dude name Ber? Berrrr? Brrrahh? What in the shut kinda shit is dis?

Let me get serious for one moment… so I met him at Madison Pour House. He was a complete beer nerd. So annoying. He wanted to try everything… I just got the juice bomb which I knew I liked.

He kept complaining about every fucking beer, even the one he ordered which he didn’t try for some reason. I just wanted to sit, so finally, the idiot picks a beer out.

We sit. He’s asking all these crazy questions. He told me he had 8 siblings. He actually had it on his profile, but I’m sorry, I have many matches and many people I was chatting with, I only look at a profile for a moment.

Finally, we were gonna leave. I tried to end it there, he was pushy.

I texted my secret weapon. Jake! I was like bro call me with an emergency now bro.

So he calls and lmfao I was dying when he said this… he said, “there is a small fire I need you in the lab now”

So he had to drive me there. God he was annoying. He kept touching my ass. I felt trapped. But I had to play it cool so I made out with him (horrible kisser) then I ran off.

He kept texting me and I’m talking to Jake like WHAT THE FUCK DO I DO?

Jake says, just tell him you aren’t feeling it. Ugh. That’s so hard to do. So I just ignored him when he kept texting me.

If that lame mother fucker thinks he will ever enter my body… I have a lot of work to do. Obviously I’m not as accomplished as I want to be.

So today, I’m going to the fucking gym. Somethings gotta give.

Obviously I’m the problem.

Well, another day, another lunch date. Let’s get this free food!

I’ve always wanted to go to the iron gate cafe, so today’s the day.

He still reached out. Lord Christ give men the ability to read my fucking mind cause idk wtf to do anymore.