"Sodium hydrogencarbonate" Essays and Research Papers

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    yield:! ! ! ! ! ! percentage yield crude acetaminophen:! ! 1.3403g 63.3% Decolorization of crude acetaminophen The color is now a very pale brown/pink and the crystals have a shimmery look to them‚ they are still very distinct crystals. weight sodium dithionite:! ! ! water:!! ! ! ! ! weight of purified acetaminophen:!! ! ! ! 2.0213g 15mL 0.90218g Yield Calculation and Melting-Point Determination weight crystalized acetaminophen:! ! 0.4042g percentage yield:! ! ! ! ! 42.62% melting point crude

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    Soil pH Measurement

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    affected by both acid and base-forming ions. The acid forming cations are positively charged ions they commonly include hydrogen ions‚ aluminium ions ‚and iron(II and III ions). Base forming cations commonly comprise of calcium ions‚ magnesium ions‚ sodium ions and potassium ions. It is also known that the CEC is positively correlated with soil pH. As the dilution of the soil solution increases‚ the pH is also seen to increase. The effect of adding water and occasional mixing during the 30 minute

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    Lab 4: Physical & Chemical Properties Purpose: The purpose of this lab is to distinguish if different substances react to heat or cold and if a solution is added to it during the experiment will it change the substance or leave it the same. Throughout the different tests each substance is put through a series of tests to determine if it changes in any way in regards to color‚ odor‚ or consistency from the start of the experiment. The results will be documented in table 1. Data Table 1: Solubility

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    Chemistry Exam Questions

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    student is to accurately determine the concentration of a solution of sodium hydrogencarbonate in a titration against a standard solution of hydrochloric acid‚ HC1. The first step in this experiment is to accurately dilute 100.0 mL of a 1.00 M HCl stock solution to a 0.100 M solution using a 1.00 L volumetric flask. However‚ instead of using distilled water in the dilution‚ the student mistakenly adds 900.0 mL of 0.0222 M sodium hydroxide‚ NaOH‚ solution. a. Write an equation for the reaction that

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    Chem 16 Final Paper

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    Abstract Qualitative analysis‚ a branch of analytical chemistry‚ deals with the identity of a substance found in a given sample‚ and not the amount of substance in it. It only concerns the substances present or absent in a given sample. Qualitative analysis is therefore used to determine unknown ions present in chemical samples by observing and analyzing results from various reactions of the sample with chemicals. Qualitative analysis is done through a series of steps. It is usually divided

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    Steam Distillation – Clove Oil Abstract: In this experiment‚ a situ method steam distillation was performed and essential oils were isolated from cloves. Once the oils were obtained‚ extraction techniques were used to extract a crude‚ eugenol‚ and acetyleugenol product sample. These samples were submitted for GC analysis and the normalization area percents were calculated to confirm their purity; for the crude sample it was 93.95% eugenol and 6.05% acetyleugenol‚ for the eugenol sample it

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    Kinetics of a Reaction I. List of reagents & products 1. 1.0 M Copper(II) nitrate (Cu(NO3)2‚ 0.10 M Hydrochloric Acid (HCl)‚ 0.010 M Potassium Iodide (KI)‚ 0.040 M Potassium Bromate (KBrO3)‚ 0.0010 M Sodium Thiosulfate (N2S2O3)‚ 2% Starch solution‚ Water (H2O) II. Summary of Procedure. Part 1: Find the Volume of One Drop of Solution 2. Fill pipet with 3ml of distilled water 3. Mass a beaker and record 4. Put 5 drops of water into beaker and record

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    Solubility Curve of Sodium Nitrate Data collection |Temperature (°C) |  |Mass of solute in 5ml (g) |Mass of solute in 100ml (g) | |1st set of data |2nd set of data |Average |  |  | |23.5 |24.0 |23.8 |4.5

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    Sodium borohydride Reduction of Benzil Introduction: The Purpose of this experiment is for the students to learn how to use sodium borohydride to reduce benzil to its secondary alcohol product via reduction reaction. This two-step reaction reduces aldehydes by hydrides to primary alcohols‚ and ketones to secondary alcohols. In order for the reaction to occur and to better control the stereochemistry and yield of the product‚ the metal hydride nucleophile of the reducing agents such as LiH‚ LiAlH4

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    Dental amalgam Question 5. What is the percentage of pure gold in a 12-carat gold bracelet? A. 25% B. 50% C. 75% D. 100% Question 6. Which of the following metals is not naturally found as a pure element? A. Platinum B. Silver C. Gold D. Sodium Question 7. During the process of froth flotation‚ waste material is separated from the ore. This waste material is called A. the overburden B slag C gangue D a mineral Question 8. Moving through the activity series for metals from potassium

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