Titrate 1.2035g of solid KHP (KC3H5O4) requires 23.89 mL of an unknown NaOH solution to reach the equivalence point. What's the molarity of this unknown NaOH solution? Show your work. O 1.23 0.247 0.231 0.147
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- You may want to reference (Page 834) Section 18.3 while completing this problem. Part A If 130.0 mL of 0.0020 M Na2SO4 (aq) is saturated with CaSO4, how many grams of CaSO4 would be present in the solution? [Hint. Does the usual simplifying assumption hold?] Express your answer using two significant figures. VE ΑΣΦ ? m = 0.43 Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining gA standardized iodine solution is used to titrate hydrazine sulfate in a sodium bicarbonate- buffered solution. The reactions that occur are I2 + 2e- = 2I N2H4 .H2SO4 → N2 + SO4 2- + 6H+ + 4e- What is the molarity of a solution of hydrazine sulfate when 27.29 mL of 0.100 N iodine is required to titrate 25.00 mL of the hydrazine sulfate to the equivalence point?1. A sample of pure sodium oxalate, Na2C2O4 , weighing 0.2856 g is dissolved in water, sulfuric acid is added, and the solution titrated at 70°C , requiring 45.12 mL of a KMNO4 solution. The end point is overrun and back-titration is carried out with 1.74 mL of a 0.1032 N solution of oxalic acid. Calculate the normality of the KMNO4 solution. Hint: A redox reaction is involed between oxalate and permanganate. Look at the changes in oxidation state by determining the balanced redox reaction: 5C20,2 + + 2MN2+ 2 Mn04 + 10H* → 10CO2 + 8H20
- Let an n-protic acid be an acid that can donate n hydrogen ions and has the formula HnX.If 0.900 L of 0.400 M sodium hydroxide is required to titrate 0.400 L of a 0.300 M HnX to theequivalence point, what is n in HnX?A. 1B. 2C. 3D. 4E. 52. Titrate 1.2035g of solid KHP (KCH;O4) requires 23.89 mL of an unknown NaOH solution to reach the equivalence point. What's the molarity of this unknown NaOH solution? Show your work.What weight of potassium hydrogen phthalate will require 30. mL of a 0.30M NaOH solution to reach the equivalence point? KHP MM 204.22 g/mol .CO;K' .CO;K' NaOH + H2O + *CO,H COƠ,Na'
- 3.A sample is known to contain NaOH, Na2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCl ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample? ww wwChemistry If 110.0 mL of 0.0030 MNa2SO4(aq) is saturated with CaSO4, how many grams of CaSO4 would be present in the solution? [Hint: Does the usual simplifying assumption hold?] Express your answer using two significant figures. This answer not 0.07 0.084, 0.09Molarity of the standard solution of sodium hydroxide = 0.1010 mol/L %3D Volumes of NAOH(aq): Third Rough titration First Second titration titration titration Final burette reading: 18.48 33.58 48.40 23.72 (mL) Initial burette reading: (mL) Volume of NaOH(aq) Titrated (added) (mL) 3.48 18.48 33.60 8.73 Fourth Fifth titration titration Final burette reading: (mL) Initial burette reading: (mL) Volume of NaOH(aq) Titrated (added) (mL) 38.68 20.62 23.80 5.75 4. (a) The sodium ion did not take part in this chemical reaction. What do we call such an ion? (b) Draw a simple diagram which shows how the sodium ion mixes with water in solution. What do we call this physical process? 4
- 1. Titrate 15.00 mL of 0.256 M KHP solution requires 20.75 mL of an unknown NaOH solution to reach the equivalence point. What's the molarity of this unknown NaOH solution? Show your work. 2. Titrate 1.2035g of solid KHP (KC3H,O4) requires 23.89 mL of an unknown NaOH solution to reach the equivalence point. What's the molarity of this unknown NaOH solution? Show your work.Molarity of the standard solution of sodium hydroxide = 0.1010 mol/L %3D Volumes of NAOH(aq): Third Rough titration First Second titration titration titration Final burette reading: 18.48 33.58 48.40 23.72 (mL) Initial burette reading: (mL) Volume of NAOH(aq) Titrated (added) (mL) 3.48 18.48 33.60 8.73 Fourth Fifth titration titration Final burette reading: (mL) Initial burette reading: (mL) Volume of NaOH(aq) Titrated (added) (mL) 38.68 20.62 23.80 5.75 3. What type(s) of reactions occurred in this titration?You prepare a standard NaOH solution for the laboratory, using potassium hydrogen phthalate (KHC₈H₄O₄, 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 (HC₆H₇O₆, molar mass 176.12 g/mol) also has one acidic hydrogen, and is usually mixed with some filler in preparing the tablets. It requires 17.54 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?