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- Explain the cleansing action of soap.-PRESERVATIVES- hi please help me with this problem need it until 11:21 am thank you. JUST MAKE IT SHORT AT LEAST 2-4 SENTENCES PLEASE DONT MAKE IT LONG THANK YOU! How does sugar preserve food materials? Is it a better preservative than salt? Why or why not?25. How many milliliters of water should be added to 100 mL of a 1:125 w/v solution to make a solution such that 25 mL di- luted to 100 mL will yield al:4000 dilu- 33. tion? of a lotion base f oxico- 26. How many milliliters
- In carrying out the first standardization in this experiment, a student used 0.5169 g of potassium hydrogen phthalate (KHP) and 24.17 mL of a NaOH solution are needed to reach the equivalence point. What is the concentration (in mol/L) of the student's NaOH solution? Include only the numerical answer (no units). be careful with significant digitMaterials Needed solid I2 solid CUSO4-5H20 food dye solid (NH4)2SO4 heavy metals waste container halogenated waste container non-halogenated waste container semi-micro test tubes and rack regular test tubes and rack squash pipettes acetone cyclohexane propan-2-ol Method Part A: Solubility of ionic and molecular solids 1. Place a small amount (about the size of 1 grain of rice, see picture) of copper sulfate into each of three DRY semi-micro test tubes. Add 20 drops of water to the first test tube and gently flick the test tube with your finger to ensure mixing. 2. Repeat step 1 using acetone in place of water as the solvent in the second test tube. 3. Repeat step 2 replacing acetone with cyclohexane in the third test tube. Hold the test tubes against a white background to compare the solubility of copper sulfate in the three solvents and record your results. Discard these mixtures into the heavy metals waste container in the fume cupboard. Once these test tubes have been emptied you…A 12.7g sample of vinegar is titrated. It requires 19.75 mL of 0.205 M NaOH to neutralize the acetic acid (CH3COOH) in the vinegar. Calculate the weight percent (w/w) of acetic acid in the vinegar. Note: 1 mole of base neutralizes 1 mole of acid.
- 1. A solution contains a mixture of Na2CO3 and NaOH. Using phenolphthalein indicator 25 mL of mixture required 19.5 mL of 0.995 M HCl for the endpoint. With methyl orange, 25 mL of solution required 25 mL of the same HCl for the endpoint. Calculate grams per liter of Na2CO3 in the mixture. a.23b.36 c.78 d.112. A 1.2040 g sample containing sodium carbonate and inert material was dissolved in water and titrated to methyl orange end point, requiring 32.50 mL of 0.1020 M HCl. Calculate the %Na2CO4 in the sample. a. 93.36% b. 14.59% c. 12.75% d. 23.41%3. A 0.1510 g KHP (MW = 204.22 g/mol) sample required a volume of 57.04 mL of NaOH solution to reach a phenolphthalein end point. Calculate the molarity of NaOH titrant. a. 0.02593 M b. 0.006481 M c. 0.01296 M d. 0.01012 M40.00 mL of unknown calcium hydroxide solution is titrated with 0.400 M standard nitric acid solution. If 39.37 mL of the standard acid solution is required to reach a phenolphthalein endpoint, what is the molarity of the unknown calcium hydroxide solution?Normality is same as Molarity for sodium hydroxide and normal = molar (for NaOH) Normality of sodium hydroxide = 0.10395N (normal) or Molarity of NaOH = 0.10395M (molar) Volume of NaOH consumed during the titration = 21.87 mL Mol wt of Naproxen = 230.26 g/mol Weight of Naproxen ds (i.e., sample) = 0.534g Calculate the % Purity (dried-basis) of Naproxen ds, given that the LOD results for Naproxen = 1.0% a 97.0 b 98.0 c 98.5 d 99.0 e 99.5 f none of the other answers.
- A lake water sample was analyzed. During analysis of dissolved oxygen using Winkler's method, results showed a 5.8 mg/L D.O. concentration. From the result, is the lake water sample within the acceptable limit to support aquatic life? yes noSan Pellegrino mineral water is 208 mg of calcium per liter according to the FDA. A. What is the calculated molarity of calcium for this drinking water? B. From the titration data below how does the student data compare with this actual value? San Pellegrino 25 mL water sample took net volume of 75 mL to turn from pink to blue (student had to fill buret more than once and add 2 net volumes together).1. What is the molecular weight of disodium ethylenediaminetetraacetate? 2. What is the weight (in grams) to prepare a 350 mL of 0.047 M solution? 3. What is the concentration when converted to Normality? 4. What would be the titer value (in milligrams) of this solution be in terms of magnesium sulfate?
