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- 1. Forgetful Freddy weighed his KHP sample, but forgot to bring his report sheet along, so he recorded the mass of KHP on a paper towel. During his titration, which required18.46 mL of base, he spilled some base on his hands. He remembered to wash his hands, but forgot about the data on the towel, and used it to dry his hands. When he went to calculate the molarity of his base, Freddy discovered that he didn’t have the mass of his KHP. His kindhearted instructor told Freddy that his base was 0.2987 M. Calculate the mass of Freddy’s KHP sample. 2. What mass of solid NaOH would be needed to make 645 mL of Freddy’s NaOH solution?A chemist is calibrating a solution of NaOH, which you happen to know is 0.445M in NaOH. You are watching with amused interest to see if he gets it right. He is using a solution containing precisely 4.63*10 -3 mol of potassium hydrogen phthalate, an acid with a single dissociable hydrogen. How many mL of the NaOH solution should it take to neutralize the acid?It is desired to prepare exactly 100. mL of sodium chloride solution. If 2.71 g NaCl is weighed out, transferred to volumetric flask, and water added to the 100-mL mark, what is the molarity of the resulting solution?
- A teaspoon of table sugar contains about 0.01 mol sucrose. What is the molarity of sucrose if a teaspoon of sugar has been dissolved in a cup of tea with a volume of 200 mL?A 0.415 g sample of aspirin prepared in the laboratory is dissolved in 95% ethanol, diluted with water, and titrated to the endpoint with 18.5 mL of a 0.135 M NaOH, what is the % purity of the aspirin.If you prepare 25 mL of a solution with 100 mM Na2SO4 and another solution with 0.5 L of 30 mM BaCl2, and then mix them how what mass (in g or mg) of BaSO4 would you produce? If you (safely) assume that the Na+ and the Cl- completely dissociates from their counterions (the (-) charges of (+) charged ions) what is the concentration of Na+ and Cl- in the water?
- If you prepare 25 mL of a solution with 100 mM Na2SO4 and another solution with 0.5 L of 30mM BaCl2, and then mix them how what mass (in g or mg) of BaSO4 would you produce? If you (safely) assume that the Na+and the Cl- completely dissociates from their counterions (the (-)charges of (+) charged ions) what is the concentration of Na+and Cl- in the water?Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP.If 33.7 mL of a sodium hydroxide solution are needed to neutralize 1.28 grams of KHP, what is the molarity of the sodium hydroxide solution?Barium sulfate, BaSO4 , is used in medical imaging of the gastrointestinal tract because it is opaque to X rays. A barium sulfate solution, sometimes called a cocktail, is ingested by the patient, whose stomach and intestines can then be visualized via X-ray imaging. If a patient ingests 240 mL of a saturated barium sulfate solution, how much toxic Ba2+ ion has the patient consumed? The solubility product Ksp of BaSO4 is 1.10×10−10 .
- 6 If 860 mLs of 0.407 M K3PO4 are mixed with 746 mLs of 0.557 M Mg(NO3)2, what is the mass in grams of the resulting precipitate? Answer with proper sig figs6 If 860 mLs of 0.407 M K3PO4 are mixed with 746 mLs of 0.557 M Mg(NO3)2, what is the mass in grams of the resulting precipitate?Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP.If 24.14 mL of a sodium hydroxide solution are needed to neutralize 1.667 grams of KHP, what is the concentration (mol/L) of the sodium hydroxide solution?fill in the blank 3ef718fb4049f82_1