An unknown sample gives polarographic signal of 10 microamps. If 1.0 mL of 0.05 M standard...
An unknown sample gives polarographic signal of 10 microamps. If 1.0 mL of 0.05 M standard is added to 25.0 mL of unknown, the signal increases to 15 microamps. Find the concentration of the unknown.
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An unknown sample gives polarographic signal of 10 microamps. If
1.0 mL of 0.05 M standard...
A 25.0 ml sample of a 0.100 M solution of aqueo us ammonia is titrated with a 0.125 M solution of HCI.
Ka * Kb = Kw = 1.0 X 10-14 A 25.0 ml sample of a 0.100 M solution of aqueo us ammonia is titrated with a 0.125 M solution of HCI. Calculate the pH of the solution after 0.00, 10.0, 20.0, 30.00, and 40.0 mL of acid have been added; Kb of NH3= 1.8 X 10-5 at 25 °C. Hint: First find the moles after each 10.00 ml of acid is added. Then find the concentration after equilibrium is reached.
2. A 25.0 mL sample of unknown HBr is titrated with 0.100 M (NaOH). The equivalence...
2. A 25.0 mL sample of unknown HBr is titrated with 0.100 M (NaOH). The equivalence point is reached upon the addition of 18.36 mL of the base Calculate the concentration of the unknown HBr (25 pts)
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and...
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and diluted to the exact 100 mL mark in a volumetric flask. Two 20.0 mL samples of this solution were taken. In the first sample, a Cr-EDTA complex is developed and sufficient water is added to give a total volume of 100.0 mL. In the second sample, 10.0 mL of Cr(III) standard solution at to concentration of 15 mM was added before developing the Cr-EDTA...
6. A student titrated 50.0 mL of the 0.10 M unknown diprotic H2A with 0. 10 M NAOH. After 25.0 mL of NaOH was added...
6. A student titrated 50.0 mL of the 0.10 M unknown diprotic H2A with 0. 10 M NAOH. After 25.0 mL of NaOH was added, the pH of the resulting solution was 6.70. After 50.0 mL of NaOH was added, the pH of the solution was 8.00. What are the values of Ka1 and Ka2?
6. A student titrated 50.0 mL of the 0.10 M unknown diprotic H2A with 0. 10 M NAOH. After 25.0 mL of NaOH was added,...
17.04 ml of hydrochloric acid solution of unknown concentration is titrated with a 0.201 M standard...
17.04 ml of hydrochloric acid solution of unknown concentration is titrated with a 0.201 M standard solution of NaOH(aq). Compute the concentration of the hydrochloric acid solution given that 9.32 ml of the standard solution were added to reach the equivalence point.
1.Calculate time required to deposit 0.100 g of Thallium on a cathode when 100mA current is...
1.Calculate time required to deposit 0.100 g of Thallium on a cathode when 100mA current is passed through a 100Ml 0.01M Thallium solution. 2. A solution containing an unknown concentration of Cu2+ ions gives a diffusion current of 12.3 µA on a DC polarogram. Upon addition of 0.100 mL of 1.00 x 10-3 M Cu2+ solution to the 5ML of the Unknown, the new current is 28.2µA. Calculate the concentration of CU2+ in the unknown solution 3. Zinc is to...
68.5 mL of a HNO3 solution with unknown concentration is titrated with 0.150 M KOH solution....
68.5 mL of a HNO3 solution with unknown concentration is
titrated with 0.150 M KOH solution. The end point is reached after
25 m/L of KOH solution is added. what is the molarity of the HNO3
solution ?
1 р . HNO3 + KOH --> KNO3 + H20 68.5 mL of a HNO3 solution with unknown concentration is titrated with 0.150 M KOH solution. The endpoint is reached after 25.0 mL of KOH solution is added. What is the molarity...
QUESTION 1 A 25.00-ml sample of propionic acid. HC H 50 of unknown concentration was titrated...
QUESTION 1 A 25.00-ml sample of propionic acid. HC H 50 of unknown concentration was titrated with 0.151 M KOH. The equivalence point was reached when 41.28 ml of base had been added. What is the hydroxide ion concentration at the equivalence point? K, for propionic acid is 13 x 10 at 25°C. O A 1.1 x 10 M 93-8.5 x 10 M OC 1.5x 10M OD. 1.0 x 10PM O E 1.1 X 10M
A standard solution containing 5.6 10-8 M iodoacetone and 2.5 10-7 M p-dichlorobenzene (an internal standard)...
A standard solution containing 5.6 10-8 M iodoacetone and 2.5 10-7 M p-dichlorobenzene (an internal standard) gave peak areas of 306 and 877, respectively, in a gas chromatogram. A 3.00 mL unknown solution of iodoacetone was treated with 0.100 mL of 1.0 10-5 M p-dichlorobenzene and the mixture was diluted to 10.00 mL. Gas chromatography gave peak areas of 685 and 329 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00 mL of original unknown.
A 31.00 mL sample of an unknown H3PO4 solution is titrated with a 0.130 M NaOH...
A 31.00 mL sample of an unknown H3PO4 solution is titrated with a 0.130 M NaOH solution. The equivalence point is reached when 26.08 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is H3PO4(aq)+3NaOH(aq)→3H2O(l)+Na3PO4(aq)
2. A 25.0 mL sample of unknown HBr is titrated with 0.100 M (NaOH). The equivalence point is reached upon the addition of 18.36 mL of the base Calculate the concentration of the unknown HBr (25 pts)
To analyze the chromium in an unknown sample 1.5623 f of the sample was pretreated and diluted to the exact 100 mL mark in a volumetric flask. Two 20.0 mL samples of this solution were taken. In the first sample, a Cr-EDTA complex is developed and sufficient water is added to give a total volume of 100.0 mL. In the second sample, 10.0 mL of Cr(III) standard solution at to concentration of 15 mM was added before developing the Cr-EDTA...
6. A student titrated 50.0 mL of the 0.10 M unknown diprotic H2A with 0. 10 M NAOH. After 25.0 mL of NaOH was added, the pH of the resulting solution was 6.70. After 50.0 mL of NaOH was added, the pH of the solution was 8.00. What are the values of Ka1 and Ka2?
6. A student titrated 50.0 mL of the 0.10 M unknown diprotic H2A with 0. 10 M NAOH. After 25.0 mL of NaOH was added,...
68.5 mL of a HNO3 solution with unknown concentration is
titrated with 0.150 M KOH solution. The end point is reached after
25 m/L of KOH solution is added. what is the molarity of the HNO3
solution ?
1 р . HNO3 + KOH --> KNO3 + H20 68.5 mL of a HNO3 solution with unknown concentration is titrated with 0.150 M KOH solution. The endpoint is reached after 25.0 mL of KOH solution is added. What is the molarity...
QUESTION 1 A 25.00-ml sample of propionic acid. HC H 50 of unknown concentration was titrated with 0.151 M KOH. The equivalence point was reached when 41.28 ml of base had been added. What is the hydroxide ion concentration at the equivalence point? K, for propionic acid is 13 x 10 at 25°C. O A 1.1 x 10 M 93-8.5 x 10 M OC 1.5x 10M OD. 1.0 x 10PM O E 1.1 X 10M
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