A 2.00 g samples of benzoic acid (mw = 122.2 amu) is dissolved in 50.0 g...
A 2.00 g samples of benzoic acid (mw = 122.2 amu) is dissolved in 50.0 g of lauric acid acid, which has a normal melting point of 45.0 oC. If the new solution has a depressed freezing point of 43.7 oC, what is the freezing point depression constant for lauric acid?
A.0.251 oC/m
B.3.97 oC/m *
C.3.25 oC/m
D.0.307 oC/m
E.None of the above
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A 2.00 g samples of benzoic acid (mw = 122.2 amu) is
dissolved in 50.0 g...
DATA AND CALCULATIONS Mass of lauric acid Mass of benzoic acid Freezing temperature of pure lauric...
DATA AND CALCULATIONS Mass of lauric acid Mass of benzoic acid Freezing temperature of pure lauric acid Freezing point of the benzoic acid-lauric acid mixture Freezing temperature depression, At 38-1c Molality, m molkg Moles of benzoic acid mol Molecular weight of benzoic acid (experimental) g/mo Molecular weight of benzoic acid (accepted) g/mol Percent error
DATA TABLE Mass of lauric acid (9) 8.25 1.09 42.22 C Mass of benzoic acid (g)...
DATA TABLE Mass of lauric acid (9) 8.25 1.09 42.22 C Mass of benzoic acid (g) Freezing temperature of pure lauric acid ('C) Freezing point of the benzoic acid-lauric acid mixture (C)39,11°c Going Further Questions: 1. Calculate molality (m), in molkg, using the formula AT- Kx m. The K value for lauric acid is 3.9°c-kg/mol. 2. Calculate moles of benzoic acid solute, using the molality and the mass (in kg) of lauric acid solvent. 3. Calculate the experimental molecular weight...
A sample of 4.6434 g of benzoic acid, C_7H_6O_2, is dissolved in 50.0033 g of camphor....
A sample of 4.6434 g of benzoic acid, C_7H_6O_2, is dissolved in 50.0033 g of camphor. what is the freezing point of the resulting solution? For camphor, T_f = 179.5 degree C, K_f = 40.00 degree C/m.
A solution of 1.5 g benzoic acid (C6H5COOH; MW = 122.123 g/mol) in 100.0 g of...
A solution of 1.5 g benzoic acid (C6H5COOH; MW = 122.123 g/mol) in 100.0 g of carbon tetrachloride (CCl4; MW =153.822 g/mol) has a boiling point of 77.50°C. The boiling point of pure carbon tetrachloride is 76.72°C and the melting point is -22.92°C. Calculate the molecular weight of benzoic acid in the solution. Suggest a reason for the difference between the molar mass based on the formula (listed above) and the molar mass determined in part a.
When 0.3163 g of benzoic acid (C7H6O2) was dissolved in 15.563 g cyclohexanol, the freezing point...
When 0.3163 g of benzoic acid (C7H6O2) was dissolved in 15.563 g cyclohexanol, the freezing point of the mixture was 8.19 degrees C lower than that of the pure cyclohexanol. What is the molal freezing point constnt of the cyclohexanol? (delta T = m x Kf x i)
7. A 0.653 g of a monoprotic solid acid (mw= 157 g/mol) is dissolved in water...
7. A 0.653 g of a monoprotic solid acid (mw= 157 g/mol) is dissolved in water to produce a 50.0 mL solution. The pH of this solution is measure to be pH = 2.13. Determine the ionization constant (Ka) of the acid. 8. A buffer is 0.50 M CH3COOH(aq) and 0.50 M Na(C6H-C00) (aq). For CH2COOH pKa = 4.20 a) Calculate the pH of the buffer solution. b) Calculate the pH after the addition of 40 mL of a 0.150...
12.22 g of the monoprotic acid KHP(MW = 204.2 g/mol) is dissolved into water. The sample...
12.22 g of the monoprotic acid KHP(MW = 204.2 g/mol) is dissolved into water. The sample is titrated with a 0.85 M solution of calcium hydroxide to the equivalence point. What volume of base was used?
A 50.0 g sample of ore containing FeBr2 is dissolved in acid and titrated to an...
A 50.0 g sample of ore containing FeBr2 is dissolved in acid and titrated to an end point with 24.80 mL of 0.629 M Cr2O72−. The following redox reaction takes place: Cr2O72− (aq) + Fe2+ (aq) ⟶ Cr3+ (aq) + Fe3+ (aq) a. balance the reaction b. what % of the ore sample if FeBr2 (molar mass = 215.65 g/mol)
DATA AND CALCULATIONS Mass of lauric acid Mass of benzoic acid Freezing temperature of pure lauric acid Freezing point of the benzoic acid-lauric acid mixture Freezing temperature depression, At 38-1c Molality, m molkg Moles of benzoic acid mol Molecular weight of benzoic acid (experimental) g/mo Molecular weight of benzoic acid (accepted) g/mol Percent error
DATA TABLE Mass of lauric acid (9) 8.25 1.09 42.22 C Mass of benzoic acid (g) Freezing temperature of pure lauric acid ('C) Freezing point of the benzoic acid-lauric acid mixture (C)39,11°c Going Further Questions: 1. Calculate molality (m), in molkg, using the formula AT- Kx m. The K value for lauric acid is 3.9°c-kg/mol. 2. Calculate moles of benzoic acid solute, using the molality and the mass (in kg) of lauric acid solvent. 3. Calculate the experimental molecular weight...
A sample of 4.6434 g of benzoic acid, C_7H_6O_2, is dissolved in 50.0033 g of camphor. what is the freezing point of the resulting solution? For camphor, T_f = 179.5 degree C, K_f = 40.00 degree C/m.
7. A 0.653 g of a monoprotic solid acid (mw= 157 g/mol) is dissolved in water to produce a 50.0 mL solution. The pH of this solution is measure to be pH = 2.13. Determine the ionization constant (Ka) of the acid. 8. A buffer is 0.50 M CH3COOH(aq) and 0.50 M Na(C6H-C00) (aq). For CH2COOH pKa = 4.20 a) Calculate the pH of the buffer solution. b) Calculate the pH after the addition of 40 mL of a 0.150...
12.22 g of the monoprotic acid KHP(MW = 204.2 g/mol) is dissolved into water. The sample is titrated with a 0.85 M solution of calcium hydroxide to the equivalence point. What volume of base was used?
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