In an experiment, a 500.0 mL solution of approximately 0.250 M KOH (56.106 g/mol) solution was prepared. The actual concentration was then determined by standardizing against 1.0050 g of KHP(204.22 g/mol), which required 19.45 mL of the KOH solution. One mole of KOH reacts with one-mole ofKHP. a.How would you prepare the KOH solution? b.After standardization, what will be the exact molarity of the KOH solution? c.The KOH solution was then used to analyze a sample containing oxalic acid, H2C2O4 (90.03 g/mol). If the titration required 11.33 mL KOH, how many grams of oxalic acid is in the sample? Oxalic acid releases two protons during the reaction.

a.) A 23.00-mL sample of an HNO3 solution is titrated with 0.172 M NaOH. The titration requires 28.26mL to reach the equivalence point. What is the concentration of the HNO3 solution? b.)How much heat does your body lose when 5.80 g of sweat evaporates from your skin at 25∘C? (Assume that the sweat is only water.) The heat of vaporization of water at 25∘C is 44.0kJ/mol. Express your answer in kilojoules to three significant figures.

Calculate the concentration in mol/L of a KHP solution made by dissolving 1.5594g KHP in enough water to make 100.0ml of solution?

1a. How many moles of M9SO, are contained in 50. mL of a 3.0 M solution? 1b. How many grams of CaClą are dissolved in 80.0 mL of a 0.75 M solution? 1c. What is the molarity of 300 ml of a solution that contains 0.60 mol of dissolved ammonia?

Determine the final concentration of each of the following solutions after 20mL of water has been added. A. 30mL of 5 M NaCl solution B. 125mL of 2 M CaO solution C. 200mL of 4.4 M MgCl2 solution D. 20 mL of 0.01 M AgNO3 solution

7. How many Equivalents are generated for each electrolyte solution? a. 2.0 mole Fe 3+ (aq) b. 2.5 mole SO 2- c. 4.0 mole PO 4 d. 3.5 mole CO. 3- 2- = 3 (aq) = = = 4 (aq) 8. How many mL of a 4.50 M HCl solution are needed to completely react with 20.5 g of CaCO3 if the chemical reaction is as shows below? Hint: use example in Section 9.5 2HC1 + CaCO (aq) 3(s) CaCl + CO 2(aq) 2(g) + H₂OO

4. The concentration of a NaOH solution is determine by using the solution to titrate a sample of potassium hydrogen phthalate (C8H5O4K, M = 204.22 g/mol). In the titration 34.67 mL of NaOH solution is required to react with 0.1082 g C8H5O4K to reach the equivalence point. a) Calculate the concentration of the sodium hydroxide solution. Potassium hydrogen Phthalate = 0-10829, Molar mass of KMP=204-22 Hales of KMP = Mass 0.10829 g/mol Mm 6.000529 mal 204229/Mal Concentration of NaOH = Males = = of volume of Naot (L) = 0-000529 mal 34-67 mе onl ها NaOH (mal) = 0.000015258 mal/L 0.015M b) This solution of sodium hydroxide is used for another titration. A sample of 10.0 mL of HCI is neutralized using 22.1 mL of sodium hydroxide solution. Calculate the concentration of the HCI solution. sodium hydroxide 222.1 ml, Nal100

152 A 352.44 Your Answer: 155 T 362.31 Answer 153 units Gö G D 355.67 156 X 154 365.88 359.12 157 You time travel 100 years into the future and learn that several new elements have been discovered, as pictured. These elements are frequently found as oxides, and need to be separated in order to extract the pure element. Before going through this effort, it is useful to know what amount of the element can be extracted. How many moles of element A can be extracted from 175 grams of A5012? N 369.52

True or False:

25.0-mL samples "A" and "B" (both containing HCl) were titrated with 0.100 M NaOH.  When titrating sample "A", it took 23.8 mL of titrant to reach the endpoint.  When titrating sample "B", it also took 23.8 mL of titrant to reach the endpoint.  Which of the following is correct?   a. Sample A has a higher concentration of HCl b. Sample B has a higher concentration of HCl c. Sample A has the same concentration as Sample B d. We are unable to deduce the concentration of either sample.