Chem Lab Report Essay

All standardizations are performed in triplicate. Weigh out .1000-.1200 gram KIO3. Add 70-80 mL of deionized water. Swirl and dissolve. Add 3 mL of 6M HCl. Swirl and mix. Quickly titrated the brow-red solution with 0.1M Na2S2O3 until it is light yellow. Then add 3.5 mL of starch indicator. Titrate again until the dark color first disappears.

pH was recorded every time 1.00 mL of NaOH was added to beaker. When the amount of NaOH added to the beaker was about 5.00 mL away from the expected end point, NaOH was added very slowly. Approximately 0.20 mL of NaOH was added until the pH made a jump. The pH was recorded until it reached ~12. This was repeated two more times. The pKa of each trial are determined using the graphs made on excel.

Directions: Read/ Study all the lesson information in the 5.03 lesson then click the activity tab to perform two virtual labs. (There are recorded Teaching Videos for lesson 5.03. To view them click the “Help Sign” on the announcement page. Next scroll down to Lesson 5.03 stuff and you should see 5 part video links that will cover the lesson content.)

We know that that the end point of the titration is reached when, after drop after careful drop of NaOH, the solution in the flask retains its pale pink color while swirling for about 30

16. According to the information in the table, which type of glass is Unknown D?

B. Claim: As we go from methanol  ethanol  1-propanol  1-butanol the dispersion forces increase.

When the pH is not at its optimum, the differing pH's will disrupt the bonding between the R groups of the amino acid causing its structure and the shape of the activation site to change

Purpose: The purpose of this experiment is to observe a variety of chemical reactions and to identify patterns in the conversion of reactants into products.

It mostly used to make alloys including aluminium-silicon and ferro-silicon (iron-silicon). These are also used to make dynamo and transformer plates, engine blocks, cylinder heads, machine tools, to deoxidise steel, and to make silicone( silicon-oxygen polymers with methyl groups attached), which you can make silicone rubber and oil. It can also be used extensively as a semiconductor in solid-state devices in the computer and microelectronics industries, which is made with hyperpure silicon. The silicon is selectively doped with tiny amounts of boron, gallium, phosphorus or arsenic to control its electrical properties. It can sometimes be used in, a) granite and most other rocks, which are complex silicates, and are used for civil engineering projects, b) concrete and cement, which are made with sand (silicon dioxide or silica) and clay (aluminium silicate), and c), in pottery, enamels, and high-temperature ceramics, which have silicate in them. Lastly, silicon carbides are important abrasives and are also used in lasers. Silicon benefits Arizona by making is more technology and helping people’s

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The proof (twice the % alcohol) starts at its maximum and goes down (as the alcohol evaporates). If we start with a high concentration of alcohol, we will get the azeotrope (95% alcohol, 5% water) for a while, then the concentration will decrease.

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It is not uncommon to have a percent yield less than 100% as was observed in our experiment. Imperfect percent yield can be interpreted that the condition were not optimal and could be improved. Despite careful measurements some component will still be lost during transferring between containers. One way to get a better percent yield is by minimizing transfers. A low percent yield could be a result of evaporation

Most of Na2SiO3 remained in the solid hydrothermal product and could be washed out in the following water washing process. Fig. 5. The XRD patterns of the hydrothermal products obtained from 240 °C with the NaOH/tionite ratio of 4:1 for 1h. (a) tionite, 50% NaOH solution; (b) tionite with the addition of 100% silicon content, 50% NaOH solution; (c) tionite, 45% NaOH solution; (d) tionite after desilication with the Si removal of 28.9%, 45% NaOH solution; (e) tionite after desilication with the Si removal of 57.8%, 45% NaOH