Concept explainers
You are given a colorless unknown solution that contains one of the following salts:
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Chemical Principles in the Laboratory
- 7arrow_forwardEnter a neutralization reaction for each acid and base pair. HBr(aq) and Ca(OH)2(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.arrow_forwardCalcium oxalate is a sparingly soluble ionic compound composed of calcium ions (Ca2+) and oxalate ions (C2O42–). It is a main culprit in kidney stone disease due to the formation of calcium oxalate crystals in the urine. A typical value for the concentration of calcium in urine is 0.3 grams per liter. Given a Ksp value for calcium oxalate of 1.3 × 10–8, calculate the minimum concentration of oxalate ion in urine that could lead to precipitation of calcium oxalate.arrow_forward
- 1.1The Ksp of Ca3 (PO4 ) 2 is 1.3 × 10−26 . Estimate the solubility of this salt in units of g. L −1 . You must show any reaction equation(s) that you may think are necessary. 1.2 If a sample of solid Ca3(PO4)2 is stirred into exactly one litre of a 0.550M solution of Na3PO4, how will the solubility of the salt compare with the answer that you have obtained in question 1.1? Explain you answer in a short sentence.arrow_forwardYou prepare a standard NaOH solution for the laboratory, using potassium hydrogen phthalate (KHC,H,O,, abbreviated KHP) as the primary standard. KHP (molar mass = 204.22 g/mol) has one acidic hydrogen. It took 31.55 mL of the NaOH solution to titrate (react exactly with) 0.750 g KHP. You then use the standard base solution to determine the amount of ascorbic acid in a 500.0 mg tablet of vitamin C. Ascorbic acid (HC̟H,O, molar mass 176.12 g/mol) also has one acidic hydrogen, and is usually mixed with some filler in preparing the tablets. It requires 19.14 mL of the NaOH to titrate (react exactly with) the ascorbic acid found in one 500.0 mg tablet. What is the percent vitamin C by mass in the tablet?arrow_forwardIbuprofen (also known as Brufen) is an analgesic (pain killer) and anti-inflammatory drug. It is a weak carboxylic acid (Chemical Formula: C12H17C00H; K = 1.2 x 10-5). A Medical student from Lusaka Apex Medical University (LAMU) prepared a 0.4 M solution of Brufen to give to an accident victim with minor injuries but in a lot of pain. on i. Write a reaction equation showing how Brufen ionizes in water. ii. Write the acid ionization constant expression for Brufen iii. Calculate the percent ionization of Brufen in water Select one: O A C12H17COOH(ag) + H2OM → C12H17CO0'(aq) + H3O*(aq)} K = [C;;H1¬CO0"][H30*]. [C1,H17COOH][H=0] 0.55% %3D OB. + C12COO(ag) + H3O*(aq); K= [C1;;H17C00"][H,o*j. [C2H17COOH] C12COOH(a) + H2O¶ 0.55% C12COOH(ag) + H2O) → C12COO (aq) + H30*(aq), K = [C1;H3;C00"][H30*]. [C,2H17COOH][H=0] 0.0022 %3D [CH1,CO0"][H30*]. [C1H17COOH] Go O D. C12H17COOH + H2O C12H17CO0* + H3O*|K = 0.55% %3Darrow_forward
- Iron(III) sulfate is used as a coagulant for industrial waste. Write a dissociation equation andcalculate the concentration of the solute needed to produce a Fe2(SO4)3 (aq) solution with 0.600 mol/L iron(III) ionsarrow_forwardCalculate the minimum concentration of NH3 needed to dissolve 2.00x 10 -3 mol of AgBr in 1.00 L solution. AgBr(s) → Ag' (aq) + Br (aq) Kgp = [Ag'][Br] = 5 x 1013 %3D Ag (aq) + 2NH3 (aq) → Ag(NH3)2* (aq) K; = 1.7 x 107 %3D O 1.03 M O 0.690 M O 0.686 M O 0.688 O 4.52 Marrow_forwardWhat mass of NaOHNaOH is needed to precipitate the Cd2+ ions from 30.0mL of 0.500 M Cd(NO3)2 solution?arrow_forward
- A solution of sodium hydroxide is standardized against potassium hydrogen phthalate (molecular mass = 204.224 g mol-1). From the following data, calculate the molarity of the NaOH solution. The mass of the KHP is 0.7840 g. Before the titration the buret reading was 0.8400 mL and afterwards it was 39.20 mL. A 85.12 mL sample of a solution of sulfuric acid, H2SO4, is neutralized by 59.82 mL of the NaOH solution from the problem above. Calculate the molarity of the sulfuric acid solution.arrow_forwardA 50.0 mL solution of Ca(OH) 2 with an unknown concentration was titrated with 0.340 M HNO3. To reach the endpoint, a total of 26.2 mL of HNO3 was required. Given that 0.00891 mol of HNO3 are used in the titration, What quantity in moles of Ca(OH)2 had to be present in the initial reaction?arrow_forwardConsider an 50.0 mL analyte solution containing 0.50 g of KHP, titrated against 0.10 M sodium hydroxide, NaOH (a) Based on the information you have for the hydrogen phthalate ion HP– and the fact that Kw = 1.0 × 10−14 at room temperature, what is the Kb of the phthalate ion P2–? Write the chemical equation that has a Kc equal to Kb you just calculated. (b) What is the pH of the solution at the equivalence point at room temperature? (c) Sketch the beaker again at 50% past the equivalence point. What is the pH of the solution at room temperature?arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning