The concentration of NO3– in a water sample is determined by a onepoint standard addition using...

The concentration of NO3– in a water sample is determined by a onepoint standard addition using a NO3– ion-selective electrode. A 25.00-mL sample is placed in a beaker and a potential of 0.102 V is measured. A 1.00-mL aliquot of a 200.0-mg/L standard solution of NO3– is added, after which the potential is 0.089 V. Report the mg NO3–/L in thewater sample.

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queen_honey_blossom answered 1 year ago

A detergent containing an unknown concentration of phosphate is analyzed using the standard addition method. Initially,...

A detergent containing an unknown concentration of phosphate is analyzed using the standard addition method. Initially, this solution emitted an instrumental signal of 4.78 μA. An aliquot of 10.0 ml of 3.12 M phosphate solution was added to the 80.0 ml sample. After this addition, a signal of 9.77 μA was measured. Calculate the initial concentration of phosphate in the original sample of detergent.

Copper was determined in a river sample using spectrometry and the method of standard additions. For...

Copper was determined in a river sample using spectrometry and the method of standard additions. For the addition, 100.0 μL of a 1000.0 ppm Cu standard was added to 100.0 mL of river water. Absorbance of river water: 0.572 Absorbance of river water with standard: 1.122 Calculate the concentration of copper in the river water.

The concentration of HCl can be determined by titration with a primary standard such as sodium...

The concentration of HCl can be determined by titration with a primary standard such as sodium carbonate ( Na2CO3 ). The titration reaction is CO2−3+2H+⟶H2O+CO2 What is the concentration of HCl if 38.3 mL of HCl was needed to to react with 0.501 g of Na2CO3 to reach the end point?

The concentration of HCl can be determined by titration with a primary standard such as Na2CO3...

The concentration of HCl can be determined by titration with a primary standard such as Na2CO3 (sodium carbonate). The titration reaction isCO3^(2-) + 2H+ yields H2O + CO2What is the concentration of HCl if 25.9 mL of HCl was needed to to react with 0.311 g of Na2CO3 to reach the end point?

ION-SELECTIVE ELECTRODE POTENTIOMETRY The fluoride ion concentration in a mouthwash sample was determined using ISE. Potentials...

ION-SELECTIVE ELECTRODE POTENTIOMETRY The fluoride ion concentration in a mouthwash sample was determined using ISE. Potentials of standard solutions containing fluoride ion are given in Table 1. The sample for ISE was prepared by pipetting 10.00 mL of the original mouthwash and diluting to 250.00 mL. The potential of the sample was recorded as –0.015 V. Table 1. Measurement of ISE potential of standard solutions containing fluoride ion. [F-], M Potential, mV 5.0 x 10-6 0.077 5.0 x 10-5 0.020...

An organic acid concentration in a hard sample was determined by diluting a 15.00 mL sample...

An organic acid concentration in a hard sample was determined by diluting a 15.00 mL sample of 200.00 mL solution. A 20.00 mL portion of the diluted sample reacted with 40.0 mL of 0.05417 M NaOH completed. The excess OH- was back titrated with 5.21 mL of 0.02154 M HCL. The concentration of the organic acid in the orginal sample is: Answer is 1.370 M

QUESTION 13 The movement of water across the cell membrane is determined by the concentration of...

QUESTION 13 The movement of water across the cell membrane is determined by the concentration of water on either side of the membrane. is determined by the concentration of solutes on either side of the membrane. may cause the cell to shrink or swell and even burst. All statements are true. 1.2 points QUESTION 14 What are the main components of a cell membrane? carbohydrates and proteins phospholipids and proteins nucleic acids and carbohydrates carbohydrates and phospholipids 1.2 points...

Using the appropriate Ksp values, find the concentration of NO3− ions in the solution at equilibrium...

Using the appropriate Ksp values, find the concentration of NO3− ions in the solution at equilibrium after 700 mL of 0.35 M aqueous Cu(NO3)2 solution has been mixed with 350 mL of 0.40 M aqueous KOH solution. (Enter in M.) (Ksp for Cu(OH)2 is 2.6x10-19). Now find the concentration of OH− ions in this solution at equilibrium. (Enter in M.)

A geologist examines 22 water samples for magnesium concentration. The mean magnesium concentration for the sample...

A geologist examines 22 water samples for magnesium concentration. The mean magnesium concentration for the sample data is 0.637 cc/cubic meter with a standard deviation of 0.0358. Determine the 95% confidence interval for the population mean magnesium concentration. Assume the population is approximately normal. Step 2 of 2 : Construct the 95% confidence interval. Round your answer to three decimal places.

The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate...

The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated as KHP). KHP is an acid with one acidic hydrogen and a molar mass of . In the titration, of the sodium hydroxide solution was required to react with KHP. Calculate the molarity of the sodium hydroxide.

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