This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the answers to your questions: 1. c) Proceed to the closest washbasin and thoroughly wash with cold water. 2. a) Not permitted at any time. 3. c) Open shoes such as slippers. 4. b) Volumetric flask. 5. d) Burette. 6. b) Weighing balance. 7. d) Determining the concentration of an unknown solution using a standard solution. 8. b) A solution whose concentration is precisely known. 9. b) Anhydrous sodium carbonate (Na_2CO_3). 10. a) 12 g of C-12 isotope. 11. b) Mass of solute (g) / Volume (dm^3). 12. d) A solution that changes color at the equivalence point without an external indicator (e.g., KMnO_4). 13. Step 1: Write the balanced half-reactions for the redox reaction between MnO_4^- and C_2O_4^2- in acidic medium. Reduction: MnO_4^- + 8H^+ + 5e^- Mn^2+ + 4H_2O Oxidation: C_2O_4^2- 2CO_2 + 2e^- Step 2: Balance the electrons transferred by multiplying the reduction half-reaction by 2 and the oxidation half-reaction by 5. 2MnO_4^- + 16H^+ + 10e^- 2Mn^2+ + 8H_2O 5C_2O_4^2- 10CO_2 + 10e^- Step 3: Add the balanced half-reactions to get the overall balanced equation. 2MnO_4^- + 5C_2O_4^2- + 16H^+ 2Mn^2+ + 10CO_2 + 8H_2O The balanced mole ratio of MnO_4^- to C_2O_4^2- is 2:5. 14. c) 60 °C. 15. b) C_2H_2O_4 · 2H_2O. 16. d) To analyze a mixture of NaOH and Na_2CO_3. 17. d) Two. 18. Step 1: Write the chemical equation for the half neutralization of Na_2CO_3 to NaHCO_3 with HCl. Na_2CO_3 + HCl NaHCO_3 + NaCl Step 2: Determine the mole ratio from the balanced equation. From the equation, 1 mole of Na_2CO_3 reacts with 1 mole of HCl. The mole ratio of HCl to Na_2CO_3 for half neutralization is 1:1. 19. Step 1: Identify the given concentrations and total concentration. Concentration of NaOH = 4 g/dm³ Concentration of Na_2CO_3 = 10.6 g/dm³ Total concentration = 14.6 g/dm³ Step 2: Calculate the percentage composition of NaOH. Percentage of NaOH = Mass of NaOHTotal mass × 100\% Percentage of NaOH = 4 g/dm^314.6 g/dm^3 × 100\% Percentage of NaOH ≈ 27.4\% Step 3: Calculate the percentage composition of Na_2CO_3. Percentage of Na_2CO_3 = Mass of Na_2CO_3Total mass × 100\% \