Which of the following are equivalent to 2,500 ppm Cu2+? MW: Cu (63.55) 2.5 ppb Cu2+ 2,500,000 ppb Cu 2.5 ppt Cu2+ 39.34 mM 0.03934 M 0.07868 N (in precipitation reaction) 0.07868 N (in redox into Cu+)
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Which of the following are equivalent to 2,500 ppm Cu2+?
MW: Cu (63.55)
2.5 ppb Cu2+
2,500,000 ppb Cu
2.5 ppt Cu2+
39.34 mM
0.03934 M
0.07868 N (in precipitation reaction)
0.07868 N (in redox into Cu+)
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- Which of the following are equivalent to 2,500 ppm Cu2+? (There may be more than one answer) MW: Cu (63.55) a) 2.5 ppb Cu2+ b) 2,500,000 ppb Cu c) 2.5 ppt Cu2+ d) 39.34 mM e) 0.03934 M f) 0.07868 N (in precipitation reaction) g) 0.07868 N (in redox into Cu+)Zinc(s) (MW=65.38), with a mass of 0.825 g, was reacted with 25.00 mL of NaClO (MW=74.44) according to the following unbalanced ionic equation. Determine the normality of NaClO.Zn(s) + ClO- → Zn(OH)2 + Cl- (in basic medium)Which of the following statements is true for the following reaction, assuming the given reaction proceeds in the forward direction? Fe"(aq) + Co(s) → Fe²"(aq) + Co2"(aq) A Fe (aq) is oxidized and Co(s) is reduced. B Fe* (aq) is oxidized and Co (aq) is reduced. Co(s) is oxidized and Fe"(aq) is reduced. (D) Co(s) is oxidized and Co*(aq) is reduced. E) Fe"(aq) is oxidized and Co(s) is reduced.
- (24) The gold-plating of a ceramic figurine requires a total of 2.78 g of solid gold. If the current being used is 12.7 amperes, how many minutes will it take to plate the gold figurine? You may assume that there is sufficient concentration of gold cation to complete the process. (A) 1.79 (B) 1056 (C) 5.36 VELG 14 (D) 68.1 (E) 4.57 8A 25.00cm3 of potassium dichromate(K2Cr2O7) solution are added to an acidified aqueous solution of potassium iodide(present in excess). The Iodine was then liberated according to the equation K2Cr2O7(aq) + 14H+(aq) + KI(aq) → K+(aq) + Cr3+(aq) + H2O(l) + I2(aq) Required 19.63cm3 of a 0.1478M Na2S2O3 for complete reaction. The equation for the reaction of between Na2S2O3 and I2 is I2(aq) + Na2S2SO3(aq) → Na2S4O6(aq) + NaI(aq) Calculate the concentration of potassium dichromate (only 4 decimal places)? mol/LA 25.00cm3 of potassium dichromate(K2Cr2O7) solution are added to an acidified aqueous solution of potassium iodide(present in excess). The Iodine was then liberated according to the equation K2Cr2O7(aq) + 14H+(aq) + KI(aq) → K+(aq) + Cr3+(aq) + H2O(l) + I2(aq) required 19.63cm3 of a 0.1478MNa2S2O3 for complete reaction. The equation for the reaction of between Na2S2O3 and I2 is I2 +(aq) + Na2S2SO3(aq) → Na2S4O6(aq) + NaI(aq) Calculate the concentration of potassium dichromate (only 4 decimal places). ________Mol/L
- 2H,O1) = H3O+(aq) + OH (aq) Kw = 1.0x 1014 at 25 °C Kw=5.5x 1014 at 50 °C Based on this data, which statements are true? You may check any combination of statements. 2H20(1) = H3O*(aq) + OH(aq) is an exothermic reaction 0.10 M NAOH solution at 50°C has pH = 12.26 Pure water at 50°C contains more ions than pure water at 25 °C.Which of the following are equivalent to 2,500 ppm Cu2+?MW: Cu (63.55) (compute for all scenarios) 2.5 ppb Cu2+ 2,500,000 ppb Cu 2.5 ppt Cu2+ 39.34 mM 0.03934 M 0.07868 N (in precipitation reaction) 0.07868 N (in redox into Cu+)4. True or False (1) Chlorine demand is the difference between total chlorine and free chlorine (2) In raw wastewater samples, most of nitrogen is in the form of nitrate. (3) If 10 mg/L of NH3-N is converted to nitrate, the nitrate concentration is 10 mg/L as N. (4) Free chlorine consists of hypochlorous acid and hypochlorite. (5) Chloramines is a weaker disinfectant than free chlorine. (6) Na2HPO4 contributes to the orthophosphates. (7) For phosphorus analysis, the purpose of the autoclave is to kill the phosphorus bacteria which interferes colorimetric analysis. (8) Chloride is an effective disinfectant for water and wastewater treatment. (9) "Crown" corrosion is caused by the corrosive action of H₂SO4. (10) Breakpoint chlorination can be used for removal of ammonia.
- Given the following information: Ni²+ (aq) + 2 e → Ni (s) Eº = -0.250 V K₁ = 1.0 x 10²² for the complexation reaction Ni²+ + 4 CN¯ → Ni(CN)₂²- Determine Eº for the reaction [Ni(CN)4] ²+2 e → Ni (s) + 4 CN- Report your answer (V) to two significant digits. Answer:Balance the following equation by selecting the coefficients in the dropdown boxes.The coefficient for C5H12 isa. 1b. 2c. 3d. 4The coefficient for O2 isa. 1b. 2c. 3d. 4e. 5f. 6g. 7h. 8i. 9j. 10The coefficient for CO2 is a. 1b. 2c. 3d. 4e. 5f. 6g. 7h. 8i. 9j. 10The coefficient for H2O is a. 1b. 2c. 3d. 4e. 5f. 6g. 7h. 8i. 9j. 10Determine Kc for the reaction 1/2 N2(g) +1/2 O2(g) +1/2 Br2(g) =>NOBr (g) From the following information. 2 NO(g) => N2(g)+O2 (g) Kc=2.1x10^30 NO(g) +1/2Br2(g)=> NOBr(g) Kc=1.4