12 120 110 100 NaNO3 90 80 70 60 50 KCI 40 NaCl 30 20 10 10 20 30 40 50 60 70 80 90 100 Temperature (°C) At 40 g of solubility and 70 degrees C, KCI is Solubility (grams of solute/100 g H,0) FONY
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- Submit a clean, dry, and properly labeled 50-mL reagent bottle for your unknown solution. Pipet 20.00 mL of the sample in 250-mL Erlenmeyer flask. Add 5 mL of buffer and 5 drops of indicator. Titrate the solution until it turns light blue. If the titration consumes more than 50 mL of the titrant, dilute the sample accordingly. Compute for ppm of CaCO3 using the following table. Mean Molarity = 2.487 x 10^-3 MBlank correction = 0.015 Formula = V (mL) titrant x Mean Molarity of Titrant x Molecular weight of CaCO3 x 1/V (L) sampleThe 1875 Chamber Street fire claimed many victims. A whiskey distillery in Dublin went into flames and released a river of whiskey, crowds gathered along the stream of alcohol to scoop up the liquor using caps, porringers, and other vessels. In all, 13 people died, not because of the fire, but ofalcohol poisoning. a. If the average human weights 137 pounds, the Human LD50 of ethanol is ~2000mg/kg. And the typical content of alcohol in whiskey is 40% . How much alcohol does the average human must drink to succumb to alcohol poison. Assume the density of whiskey is 1 so that 1 ml of whiskey is 1 gram of whiskey. In addition, assume that the LD50 is the amount required to succumb to alcohol poison.a) What would you expect the magnitude and sign of ΔHSOLUTE, ΔHSOLVENT, and ΔHMIXING to be for CH2Cl2 as solute and acetone as solvent? Circle your choices below. Then, fill in the most important IM force that exists between solute molecules, between solvent molecules and between solute and solvent molecules. Magnitude Sign Most important force between Hsolute small. moderate large pos neg solute&solute Hsolvent small. moderate large pos neg solvent&solvent Hmixing small. moderate large pos neg solute&solvent b) Based on this, what is the overall enthalpy change (HSOLUTION) for dissolving CH2Cl2 in acetone expected to be? (negative/positive/ near zero). Would you expect CH2Cl2 to dissolve in acetone? (yes/no). Explain your answers to both of the questions above. Consider the energy and entropy contributions discussed in class
- What is the concentration in units of grams of dye per liter of solution ,of the dilute dye solution that is produced as follows? transfer 19.53 ml of stick solution (6.10g/L) to a 200.0Ml volumetric flask and dilute to the 200 ml line with deionized water. Correct number of significant figs1 kg solution of aqueous oxalic acid was made by dissolving 10g of C2H2O4 and is used as a disinfectant. The disinfectant was made at 30oC and is 3.5% dissociated. Determine: (a) Vapor pressure of solution (b) Boiling pt. of solution (c) Freezing point depression (d) Osmotic pressureBristol Community College Fall River, Massachusetts Experiment 6: Molar Mass of a Molecular Solid from Freezing Point-Depression Measurement Name: __________________________________ Date: _______________ Approved: ___________ DATA SHEET Mass of lauric acid (in Part II) Mass of benzoic acid (in Part II) Freezing temperature of pure lauric acid (from Part I) data from Video 2 of Part I Freezing temperature of solution (from Part II) data from Video referenced in Part II Freezing point depression, Tf ( = Tf, lauric acid – Tf, solution) Molality (m) of solution ( Eq. 1) Moles of benzoic acid ( Eq. 2) Experimental molar mass of benzoic acid (Eq. 3) Calculate the molar mass of benzoic acid, C6H5COOH. Percent error Summary Questions A student determines…
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- What is the molar mass of a solution if 2.00g of the solute is dissolved onto 9.00g of solvent? The Kf is 4.5° C and the temp drops from 70.00° C ( pure solvent) to 65 00° C (solution). You Must show all work and include unit and you Must get answer to correct sig figs.If a pharmacist adds 3g of hydrocortisone (HC) to 60 g of a 5% (w/w) hydrocortisone cream, what is the final percentage strength of hydrocortisone in the product. Hint: identify first the amount of HC present in 60 grams then add the 3 grams to both the amount of solute and solution then compute for the new percentage. Answer has 2 decimal places.What's the differences between two questions? Q1) How much calcium would you ingest by drinking one 8 oz glass of your tap water? Show all calculations. -->Tap water 8Oz = 8 x 0.0296L = 0.2368L Hardness = 66.73ppm = 66.73mg/L CaCO3 1L has 66.73mg CaCO3 0.2368L has 66.73mg x 0.2368 = 15.8017mg MW of CaCO3 = 100g/mol MW of Ca = 40g/mol 100g CaCO3 has 40gf of Ca 15.8017mg CaCO3 has 40/100 x 15.8017mg Ca We would ingest 6.321mg of Ca. Q2) What percentage of the recommended daily dose of calcium (1,150 mg/day) does 1.0 L of your water provide? Show all calculations. --> 66.73mg/1150mg x 100 = 5.80% My Question) Why this calculation is wrong? I think this calculation is same with question 1. Isn't it? CaCO3 = 100g/mol, Ca = 40g/mol 100g CaCO3 has 40g Ca. 66.73 CaCO3 has 40/100 x 66.73mg Ca Ca = 26.70mg 26.70mg/1150mg x 100 = 2.32%