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4. The protein in a 1.285-g sample of an oat cereal is determined by the Kjeldahl...
The protein in foods is commonly determined by Kjeldahl titration. This involves three steps. First, the...
The protein in foods is commonly determined by Kjeldahl titration. This involves three steps. First, the sample is digested with boiling sulfuric acid, which hydrolyzes the protein and converts the nitrogen from the protein into ammonium ions. protein + H2SO4 → NH4+ + other In the second step, the solution is made basic, which converts the ammonium ions to ammonia molecules. Ammonia is volatile so it can be removed from a solution by steam distillation. The mixture from the first...
The Kjeldahl method was used to determine the nitrogen content of a protein. A 275 uL...
The Kjeldahl method was used to determine the nitrogen content of a protein. A 275 uL aliquot of a 45.1 mg/mL protein solution was digested in boiling sulfuric acid. The solution was made basic and the liberated NH, was collected in 5.00 mL of 0.0512 M HCl. A volume of 7.01 mL of 0.0174 M NaOH was required to react with the excess HCl. Calculate the weight percent of nitrogen in the protein. weight percent: wt%N
The amount of nitrogen in an organic substance can be determined by an analytical method called...
The amount of nitrogen in an organic
substance can be determined by an analytical method called the
Kjeldahl method, in which all the nitrogen in the organic substance
is converted to ammonia. The ammonia, which is a weak base, can be
neutralized with hydrochloric acid, as described by the equation NH
3 ( aq ) + HCl ( aq ) ⟶ NH 4 Cl ( aq ) If 35.0 mL of 0.150 M HCl (
aq ) is needed to...
The amount of nitrogen in an organic substance can be determined by an analytical method called...
The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia. The ammonia, which is a weak base, can be neutralized with hydrochloric acid, as described by the equation NH, (aq) + HCl(aq) → NH,Cl(aq) If 16.0 mL of 0.150 M HCl(aq) is needed to neutralize all the NH3(g) from a 2.25-g sample of organic material, calculate the mass...
The zinc content of a 1.23 g ore sample was determined by dissolving the ore in...
The zinc content of a 1.23 g ore sample was determined by dissolving the ore in HCI, which reacts with the zinc, and then neutralizing excess HCl with NaOH. The reaction of HCI with Zn is shown below. Zn(s)-2HCl(aq) → ZnCl2(aq)-H,(g) The ore was dissolved in 150 mL of 0.600 M HCI, and the resulting solution was diluted to a total volume of 300 mL. A 20.0 mL aliquot of the final solution required 9.19 mL of 0.529 M NaOH...
You want to determine the protein content in milk with the Kjeldahl method. You take 100...
You want to determine the protein content in milk with the Kjeldahl method. You take 100 g whole milk and use 100 mL of 0.5 M hydrochloric acid to collect ammonia. You needed 34.50 mL of 0.3512 M NaOH for the back-titration. Calculate the percentage of protein in the sample where CP = 6.38 (that is % protein = CP x %N) **PLEASE SHOW ME STEP BY STEP CALCULATION**
A 50.00-ml NaOH sample of unknown concentration was titrated with 0.1274 M HCI.
Titrations 1. A 50.00-ml NaOH sample of unknown concentration was titrated with 0.1274 M HCI. if 33.61 mL of the HCl solution were required to neutralize the NaOH sample, what is the molarity of the NaOH sample? Show the steps in your calculation 2. A 25.00-ml HCl sample of unknown concentration was titrated with 0.5631 M Al(OH)3. If 37.62 mL of the Al(OH) solution were required to neutralize the HCl sample, what is the molarity of the HCl sample? (Assume Al(OH)3 is...
The zinc content of a 1.45 g ore sample was determined by dissolving the ore in...
The zinc content of a 1.45 g ore sample was determined by dissolving the ore in HCl, which reacts with the zinc, and then neutralizing excess HCl with NaOH. The reaction of HCl with Zn is shown below:Zn+2HCL--ZnCl2+H2The ore was dissolved in 150 mL of 0.600 M HCl, and the resulting solution was diluted to a total volume of 300 mL. A 20.0 mL aliquot of the final solution required 8.48 mL of 0.508 M NaOH for the HCl present...
A 0.450 g sample of impure CaCO, (s) is dissolved in 50.0 mL of 0.150 M...
A 0.450 g sample of impure CaCO, (s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is CaCO,(s) + 2 HCl(aq) — CaCl, (aq) + H, 0(1) + CO2(g) The excess HCl(aq) is titrated by 4.85 mL of 0.125 M NaOH(aq) Calculate the mass percentage of Caco, (s) in the sample. mass percentage: The zinc content of a 1.03 g ore sample was determined by dissolving the ore in HCl, which reacts with the...
O.9471 g sample dimethylphthalate C6H4(COOCH3)2 (M.M.=194.19 g/mole) and unreactive species was reflux with 50.00 ml of...
O.9471 g sample dimethylphthalate C6H4(COOCH3)2 (M.M.=194.19 g/mole) and unreactive species was reflux with 50.00 ml of 0.1215 M NaOH to hydrolyze the ester group. After the reaction was complete, the excess NaOH was back-titrated with 24.27ml of 0.1644 M HCl. Calculate the percentage of dimethylphthalate in the sample
The Kjeldahl method was used to determine the nitrogen content of a protein. A 275 uL aliquot of a 45.1 mg/mL protein solution was digested in boiling sulfuric acid. The solution was made basic and the liberated NH, was collected in 5.00 mL of 0.0512 M HCl. A volume of 7.01 mL of 0.0174 M NaOH was required to react with the excess HCl. Calculate the weight percent of nitrogen in the protein. weight percent: wt%N
The amount of nitrogen in an organic
substance can be determined by an analytical method called the
Kjeldahl method, in which all the nitrogen in the organic substance
is converted to ammonia. The ammonia, which is a weak base, can be
neutralized with hydrochloric acid, as described by the equation NH
3 ( aq ) + HCl ( aq ) ⟶ NH 4 Cl ( aq ) If 35.0 mL of 0.150 M HCl (
aq ) is needed to...
The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia. The ammonia, which is a weak base, can be neutralized with hydrochloric acid, as described by the equation NH, (aq) + HCl(aq) → NH,Cl(aq) If 16.0 mL of 0.150 M HCl(aq) is needed to neutralize all the NH3(g) from a 2.25-g sample of organic material, calculate the mass...
The zinc content of a 1.23 g ore sample was determined by dissolving the ore in HCI, which reacts with the zinc, and then neutralizing excess HCl with NaOH. The reaction of HCI with Zn is shown below. Zn(s)-2HCl(aq) → ZnCl2(aq)-H,(g) The ore was dissolved in 150 mL of 0.600 M HCI, and the resulting solution was diluted to a total volume of 300 mL. A 20.0 mL aliquot of the final solution required 9.19 mL of 0.529 M NaOH...
A 0.450 g sample of impure CaCO, (s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is CaCO,(s) + 2 HCl(aq) — CaCl, (aq) + H, 0(1) + CO2(g) The excess HCl(aq) is titrated by 4.85 mL of 0.125 M NaOH(aq) Calculate the mass percentage of Caco, (s) in the sample. mass percentage: The zinc content of a 1.03 g ore sample was determined by dissolving the ore in HCl, which reacts with the...
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