You are given 3.56 grams of unknown acid. You dissolved it in 50.0mL of DI water and titrate it with 1.00M NaOH. The end point volume of NaOH was 19.7mL. What is the molar mass of the unknown? a. 276 g/mol b. 362 g/mol c. 198 g/mol d. 72.3 g/mol e. 181 g/mol
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- Suppose that you started with 5 ml of 200 mg/L Cu2+ solution and added it to 1.0g of soil. After mixing you filter it and find that the concentration of the filtered solution is 15 mg/L Cu2+. From the above scenario, calculate the mass of Cu2+ in solution Find the mass of Cu bound to the soil. Calculate the Kdist.A water contains 180 mg/l Ca, 75 mg/I Mg, 160 mg/l HCO3', and 150 mg/l CO2, all expressed as CaCO3. Assume that water is to be softened to a final Ca-hardness of 60 mg/l as CaCO3, and a final Mg- hardness of 30 mg/l as CaCO3. Also, assume that the excess lime equals 1 meq/l. MW Ca 40 Mg 24 HCO3 61 CO2 44 CaCO3 100 Calculate the required amount of lime (in mg/l): Calculate the required amount of lime (in mg/l):Be sure to answer all parts. Wastewater from a cement factory contains 0.430 g of Ca²+ ion and 0.0890 g of Mg2+ ion per 100.0 L of solution. The solution density is 1.001 g/mL. Calculate the Ca²+ and Mg²+ concentrations in ppm (by mass). ppm Ca²+ ppm Mg2+
- Rinse and fill the buret with 0.100 M HCl solution. Transfer accurately 25.0 mL of saturated calcium hydroxide solution (2g of calcium hydroxide per 100 ml of water) into two separate E-flasks. Add 2 drops of phenolphthalein to each flask and titrate each solution until the pink color disappears. Voume of HCl used: Trial 1= 6.80ml; Trial 2 = 6.30mL Determination of solubility and Ksp of calcium hydroxide 2. Compute for the moles of H+ used and the moles of OH- present. moles of H+ used = (concentration of HCl) × (volume of HCl used)moles of OH- = moles of H+ used 3. Construct an ICE table for the reaction.4. Calculate the molar solubility (in mol/L) of OH- and Ca2+.5. Determine the solubility of Ca(OH)2 in g/L. (MM of Ca(OH)2 = 74.096 g/mol)6. Calculate the Ksp of Ca(OH)2.7. Compute for the percent error of the experimental value for Ksp of Ca(OH)2 with the literature value.(Ksp of Ca(OH)2 = 8.0 × 10-6 at 25°C)Chemistry 19 9. Make 3 serial dilutions, each generating 400 mL of a 1-in-4 dilution of a 3M stock solutionOne way to increase the solubility of an insoluble salt is to increase the ionic strength of the solution. stir the solution vigorously. decrease the ionic strength of the solution. add more of the insoluble salt to the solution.