Which ion in each pair has greater charge density? Explain.(a) Na⁺ or Cs⁺(b) Sr²⁺ or Rb⁺(c) Na⁺ or Cl⁻(d) O⁻² or F⁻(e) OH⁻ or SH⁻(f) Mg²⁺ or Ba²⁺(g) Mg²⁺ or Na⁺(h) NO₃⁻ or CO₃⁻²
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Which ion in each pair has greater charge density? Explain.(a) Na⁺ or Cs⁺(b) Sr²⁺ or Rb⁺(c) Na⁺ or Cl⁻(d) O⁻² or F⁻(e) OH⁻ or SH⁻(f) Mg²⁺ or Ba²⁺(g) Mg²⁺ or Na⁺(h) NO₃⁻ or CO₃⁻²
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- Q1. A solution was prepared by dissolving 1210 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give 775 mL. Calculate (a) the molar analytical concentration of K-Fe(CN)6- (b) the molar concentration of K+. (c) the molar concentration of Fe(CN) (d) the weight/volume percentage of K3Fe(CN)6. (e) the number of millimoles of K1 in 50.0 mL of this solution. (f) ppm Fe(CN)6¹Calculate the concentration in % (w/w) of the following solutions. Assume water has a density of 1.00 g/mL. a. 5.4 g of sugar and 1.50 x 102 mL of water Concentration = % (w/w) b. 4.2 g of any solute Concentration = -assignment-take and 2.50 x 10² mL of water % (w/w) c. 5.1 g of any solute and 2.00 x 10² g of any solvent Concentration = % (w/w) Submit Answer Retry Entire Group 2 more group attempts remaining Previous Email Instructor(a) Calculate the mass percentage of Na2SO4 in a solutioncontaining 10.6 g of Na2SO4 in 483 g of water.
- A 0.709 g sample of H2C2O4·2H2O is dissolved in water and titrated to a phenolphthalein endpoint with 27.98 mL of a sodium hydroxide solution. What is the molarity of the NaOH?You have 10 mL of an 8% aqueous solution of H2Cl6Pt. The density of the solution is 1.05 kg.L-1 (a) Calculate the % platinum in this solution (b) Calculate the molar concentration of the platinum in this solution.(a) Lead azide, Pb3(N3)3 has been used as a detonator in automobile airbags. A saturated solution of lead (IV) azide contains 25 mg in 100.0 mL What is Ksp? Moles of Pb(N3)4 = folarity of Pb(N3)4 = mass molar mass 0.025 g 375.2804 g / mol = 6.66 ×10-5 mol moles volume (in L) 6.66 × 10-5 mol 1 L 1000 mL = 6.66 ×10-4 M 100 mLx The expression for the solubility product constant, Ksp iS Ksp = [Pb4+][N3-] = (s)(4s)4 = 256s5 = 256(6.66×10-4)5 = 3.3586×10-14 =3.4×10-14 How many grams of lead azide will dissolve in 500 mL of 100 M Pb(NO3)2 solution?
- (1) To analyze the concentration of chloroform precursors, or natural organic matter, in a drinking water sample, which of the following instruments should be used? (A) TOC analyzer (B) GC (C) AA (D) IC (2) To analyze the concentration of cadmium (Cd) in a water sample, which of the following instruments should be used? (A) TOC analyzer (B) GC (C) AA (D) LC (3) To analyze the concentration of the chlorine residual in a water sample, which of the following instruments should be used? (A) TOC analyzer (B) GC (C) AA (C) AA (D) IC (4) To identify an unknown organic compound in drinking water, which of the following instruments should be used? (A) TOC analyzer (B) GC (D) IC (E) DPD Method (C) conductivity (E) GC/MS (5) To evaluate the quality of a drinking water sample, which of the following parameters may NOT be tested? (A) TSS (B) turbidity (D) TOC (E) coliformsA student uses 7.500 grams of oxalic acid (H₂C₂O₄) to make 250.0 cm³ of solution in a volumetric flask. She then transfers 20.0 cm³ of the solution to a conical flask with a pipette. What is the concentration in mol·dm⁻³ of the oxalic in the conical flask? [Round the answer to three decimals. Do not type in the percentage sign. Use a decimal point.] *(a) Which of the following compounds is/are soluble in water at room temperature?(i) Magnesium carbonate(ii) Strontium nitrate(iii) Potassium iodide(iv) Iron hydroxide(b) When an aqueous solution of sodium hydroxide is added to an aqueous solution ofiron(III) nitrate, a red/brown gelatinous solid is formed. Write a balanced molecularequation for the reaction that is taking place. Now rewrite your equation in net ionicform.
- Classify the following substances as strong electrolytes,weak electrolytes, or nonelectrolytes:(a) Sodium permanganate (NaMnO₄)(b) Acetic acid (CH₃COOH)(c) Methanol (CH₃OH)(d) Calcium acetate [Ca(C₂H₃O₂)₂]Classify the following substances as strong electrolytes, weak electrolytes, or nonelectrolytes:(a) Sodium permanganate (NaMnO4)(b) Acetic acid (CH3COOH)(c) Methanol (CH3OH)(d) Calcium acetate [Ca(C2H3O2)2]Gold is isolated from rocks by reaction with aqueouscyanide, CN-: 4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)-------->4 Na[Au(CN)2](aq) + 4 NaOH(aq). (a) Which atoms fromwhich compounds are being oxidized, and which atomsfrom which compounds are being reduced? (b) The[Au(CN)2]- ion can be converted back to Au(0) by reactionwith Zn(s) powder. Write a balanced chemical equationfor this reaction. (c) How many liters of a 0.200 M sodiumcyanide solution would be needed to react with 40.0 kg ofrocks that contain 2.00% by mass of gold?