correct answer will receive positive comment and thumbs up thank you 6. (6pt) You measure 5.1050...
As part of Lab 11 you will make and standardize a solution of NaOH(aq). Suppose in the lab you measure the solid NaOH and dissolve it into 100.0 mL of water. You then measure 0.1993 g of KHP (204.22 g/mol) and place it in a clean, dry 100-mL beaker, and then dissolve the KHP in about 25 mL of water and add a couple of drops of phenolphthalein indicator. You titrate this with your NaOH(aq) solution and find that the...
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We dissolve 3.44 g of an unknown acid, HA, in enough water to produce 25.0 mL of solution. We titrate this solution with a 0.250 M solution of NaOH. It takes 18.3 mL of the NaOH solution to reach the equivalence point. The pH at the equivalence point is 12.00. (a) (3 points) What is the molar mass of HA? (b) (3 points) What is the pK, value of HA(aq)? (c) (3 points)...
NaOH was standardized by titration against a standard acidic solution of potassium hydrogen phthalate (KHP). 0.4798 g of KHP were dissolved in 100 ml of water to prepare the standard KHP solution. a) What is the molar mass of KHP? (you need to look up its formula and calculate its molar mass from the periodic table). b) If 45.22 ml of sodium hydroxide were required to neutralize the KHP solution, what is the molarity of NaOH?
4. Vinegar is a solution of acetic acid. Acetic acid has a 1:1 ratio when reacted with NaOH. a. Suppose that the molarity of acetic acid in vinegar is 0.5 M, how many grams of acetic acid are present in the 5 ml of vinegar solution used in the titration? (molar mass of acetic acid = 60 g/mol). b. If vinegar has a density of 1.01 g/mol. Calculate the % of acetic acid in vinegar by mass. 5. 50 ml...
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Materials: NaOH MW = 40 g/mL, KHP - potassium hydrogen phthalate, KHC2H4O4, MW = 204.23 g/mol. Acetic acid, HC2H302, MW = 60.05 g/mol Part 1: Standardization of NaOH Assume 0.951 g of KHP is weighed and transferred to a 250 mL Erlenmeyer flask. Approximately 50 mL water is added to dissolve the KHP. Note that the exact volume of water is not important because you only need to know the...
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CALCULATIONS A. NaOH Preparation: Approximate molarity of NaOH 0.48 M B. NaOH Standardization: Trial # Mass of KHP E 1.7249 1.9569 1.8799 Volume of NaOH 18.58 L 20.58mLihat 19.71 mL Molarity of NaOH 0.4544 M 0.4654M 0. 3 M 0.4668M Average molarity of NaOH: 0.4668 M 0.4622 M C. Molar Mass of NH X Salt 1. Volume of NaOH 0.025 0.025 0.025L 2. Molarity...
LAB PARTNER Pre-Lab Questions Answer questions 1-6 after you have read the lab experiment and studied titration in your textbook (section 7.5) and/or in the lab manual (pages xxi-xxiv). Show your work fully and clearly. Calculate the molar mass of NaOH and the molar concentration of a solution containing 3.978 g of NaOH in 750.0 mL 1. Calculate the number of moles of HCl in 50.00 mL of 0.1444 M HCl. 2. Continued on the next page. 3. Calculate the...
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NAME SECTION DATE REPORT FOR EXPERIMENT 22 INSTRUCTOR Neutralization-Titration 1 Data Table Sample 1 Sample 2 Samples (if needed) Mass of flask and KHP Mass of empty flask 94.79949 93.66169 1.1218 95.3960 94.21442 1.1656 36.94 L Mass of KHP Final buret reading / P.as Initial buret reading 0.15- 18.24 L Volume of base used CALCULATIONS: In the spaces below show calculation setups for Sample 1 only....
Oxalic addindate CH2OT-2H2 Fill out the table with the appropriate data from Part C, Trial 1 Trial 2 439 Mass of Oxalic Acid Dihydrate (g) Moles of Oxalic Acid Dihydrate (Convert grams of oxalic acid to moles using the molecular weight of oxalic acid dihydrate) Moles of NaOH (Convert moles of Oxalic Acid Dihydrate to moles of NaOH using the mole ratio from the reaction) 25mL 41.6mL 41.35 mL Initial burette reading (mL) 2omL 32.00ML Final burette reading (mL) Volume...
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(2) What is the molar concentration of H30* in a solution whose pH is equal to 2? (3) You will titrate a solution of an unknown acid (HX(aq)) by adding NaOH(aq). Suppose that 25 mL of 0.5 M NaOH(aq) is needed to reach the equivalence point. How many moles of HX were present initially? Show the calculation. (4) You will titrate acid solutions by adding 0.2-0.3-mL or 2-3-ml portions of NaOH(aq). When should...