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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- A sample with a density of 0.502 kg/L was tested in the laboratory. Upon the arrival, a 3 uL of the sample was diluted until the volume was 250 uL. The laboratory assistant who used a different analysis method, computed the molarity of the sample solution was 0.159 M. Determine the concentration of the original sample in percent by volume in a solution (% v/v).Which of the following will result to a brightly lit light bulb when subjected to the conductivity test? a. Mixture of 10.0 mL 1.0 M Mg(OH)2 and 10.0 mL 1.0 M HNO3 b. 70% (v/v) ethanol c. 1.0 M citric acid d. Glacial acetic acidConcentration of Acetic Acid in a Vinegar Solution. Average molarity of NaOH Volume HC₂H30₂ sample Final buret reading Initial buret reading Volume NaOH (Show all units and all calculations) Molarity of HC₂H30₂ (unrounded) Average molarity of HC₂H302 (unrounded) Deviations Average deviation Best estimate for molarity of HC₂H302 Average mass percent HC₂H302 46.4mL Oml Ran out of Base ↓ ↓ ↓ ↓ 10.014 HOA je beart giov isults weari?! ferottelucuny Cambia) 10 Kousad Question 1. A Rolaids tablet contains calcium carbonate that neutralizes stomach acid. If 44.55 mL of 0.448 M hydrochloric acid is required to neutralize one tablet, how many milligrams of calcium carbonate are in a Rolaids tablet? CaCO, (s) + 2HCl(aq) → CaCl₂ (aq) + H₂O (1) + CO₂ (g)
- Table 1: Temp vs. solubility data of ammonium chloride. Test tube g NH4Cl/10 mL H2O Crystallization temp. (ºC) 1 1.0 g/10 mL H2O 10 oC 2 1.8 g/10 mL H2O 20 oC 3 2.9 g/10 mL H2O 40 oC 4 3.8 g/10 mL H2O 65 oC 5 4.4 g/10 mL H2O 95 oC Use the table to plot a solubility curve for ammonium chloride on the graph provided below. For the best fit line, use a smooth curve. "Mass of Solute per 100 mL of H2O," should be written on the y-axis (use increments of 2g for every box). "Temperature (°C)" should be written on the x-axis (use increments of 10 °C for every 2 boxes).1. The time it takes for the crushed antacid/chalk to be dissolved in vinegar is greater than the dissolution time of antacid/chalk at room temperature water. A. True B. False 2. The broken antacid/chalk dissolved slowest in hot water than in room temperature water. A. True B. False 3. Comparing the dissolution time in a whole antacid/chalk, it is relatively slowest in room temperature water. A. True B. FalseA reagent bottle contains 250 cm3 of 0,4 mol.dm–3 oxalic acid(C2O4H2) solution. Calculate the mass of pure oxalic acid thatmust be dissolved in this solution so that its new concentration is 0,6 mol.dm–3. Assume that the volume of the solution remainsconstant
- 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+
- One 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.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)A solution of HCl was titrated against sodium carbonate. What is the average normality of acid in the given data? (MW Na₂CO3 = 106) T2 0.3479 0.3562 0.3042 Weight (g) Initial V (ml) 0.80 1.60 35.20 36.70 39.80 Final V (mL) Vol HCl used (mL) 35.10 39.40 N of HCl (eq/L) 0.1954 0.1870 Average N of HCl (eq/L)