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When bromoform (d=2.89 g/ml) and water ( d=1 g/ml) are mixed, two layers form. Is the bottom layer water or bromoform?
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- A student must prepare 7.00 L of 0.100 M Na2CO3 (106 g/mol). Which is the best procedure for preparing this solution? Measure 74.2 g Na2CO3 and add 7.00 kg of H2O. Measure 10.6 g Na2CO3 and add 7.00 kg of H2O. Measure 74.2 g Na2CO3 and add H2O until the final homogeneous solution has a volume of 7.00 L. Measure 10.6 g N22CO3 and add H2O until the final homogeneous solution has a volume of 7.00 L. Measure 74.2 g Na2CO3 and add 7.00 L of H2O.Series 9. Mixtures Brass Sand + CuSO4• 5H2O White wine Series 9. Mixtures (continued) Water and BaSO4 Oil and water Vinegar1) KOH and NaOH are dissolved in water to form a 2.48 molar solution. If 42.9 g of NaOH are used and the resulting solution has a volume of 1673 ml, how much of the pure KOH was in the solution? 2) Sucrose CizH2O1 and ethyl alcohol CH,OH are mixed to form a 14.1 %wt solution. If the density of the solution is 1.15 g/ml, find the molar concentration of the solution.
- What is the molarity of a solution prepared by diluting 8.45 mL of 28.0 % w/w NH3 (density is 0.899 g/mL) to 250.0 mL? FM(N)=14.01g/mol, FM(H)=1.01g/molA calibration curve of KCl conductivity (y-axis) vs concentration (mass percent, x-axis) is made. The equation of line of best fit is y = 578.3x + 0.380 and the R 2 is 0.9998. Based on this data what is the mass percent of an unknown KCl solution with a conductivity of 2,788 uS/cm? 6.55 % 6.12 % 4.14 % 3.98 % 4.82 %What is the concentration of a 62.0 % (w/w) concentrated nitric acid (HNO3, Mr = 63.0 g/mol) solution (density: 1.32 g/cm3) in mol/dm3 (molarity) and g/dm3 (mass concentraion) units? How many cm3 do you need to dilute into 200.0 cm3 from that concentrated nitric acid if you would like to have a solution with a concentration of 3.0 mol/dm3 ?
- 2. Calculate the number in miligram of MgCl₂ that would be needed to prepare 520 ml of a 21 % aqueous MgCl2 solution. (density of the solution is 1.1 g/ml). 3. Calculate the number of gram of NaOH that must be added to 250mL of water to make a 15% NaOH solution. (Density of solution: 1.21g/mL) 4. What weight of KCI and H₂O are needed to make 520 g. of 15 % solution. 5. Suppose that 2.5 ml of 20% AgNO3 solution (density is 1.19 g/ml) What weight AgNO3 was in the solution used?a 1.00 L aqueous solution that contains 5.00 g MgCl2 was diluted to 2.00L. a. what is the concentration of this new solution in units of %(m/v) b. what is the concentration of this new solution in units of %(m/m)? assume that solution density is 1.02 g/LA pharmacist adds distilled water to 4.00 g of a powdered drug. The final volume of the solution is 30.7 mL. What is the % W/V of the solution? The recommended concentration is 1.7% W/V. What mass, in g, of TSP is needed to make 2.7 L of solution? A formula for anti-fungal shampoo contains 2.0% W/V ketoconazole. How many litres (L) of shampoo could be made with 72 g of ketoconazole?
- Dissolved particles in the blood has a total concentration of 0.30 M. A person was given 150 mL per hour of IV C6H1206 for an hour and a half. What is the %w/v concentration given to the person?A 0.200 M K2SO3 solution is produced by A) diluting 250.0 mL of a 1.00M K2SO3 solution to 1.00 L B) diluting 100.0 mL of a 2.50 M K2SO3 solution to 250.0 mL C) diluting 20.0 mL of a 5.00 M K2SO3 solution to 500.0 mL D) diluting 1.00 mL of a 250M K2SO3 solution to 1.00 L O B C OD O AA calibration curve of NaCl conductivity (y-axis) vs concentration (mass percent, x-axis) is made. The equation of line of best fit is y = 598.3x + 0.327 and the R 2 is 0.9998. Based on this data what is the mass percent of an unknown NaCl solution with a conductivity of 2,609 uS/cm? 5.45 % 4.36 % 5.47 % 5.99 % 3.75 %