Question

Answer units Save Question 7 (10 points) A 100.00 mL sample of hard water is to be titrated with 0.03505 M EDTA solution. A small amount of Mg2+ (that required 1.63 mL of EDTA to titrate as a blank solution) is added to the hard water sample. This sample requires 13.47 mL of EDTA to reach the endpoint. What volume of EDTA is used in titrating the Ca2+ in the hard water? Your Answer units Answer Save
0 0
Add a comment Improve this question Transcribed image text
Answer #1

mL of EDTA consumed by Ca2+ = mL of EDTA consumed by sample - mL of EDTA consumed by blank

                                                    = 13.47 mL - 1.63mL

                                                    = 11.84 mL

Since 1 L = 1000 mL, 11.84mL = 0.01184 L.

Moles of EDTA consumed by Ca2+ = molarity of EDTA x Volume of EDTA

= 0.03505M x0.01184 L

= 0.000414992 mol

Since EDTA and Ca2+ reacts 1:1 mole ratio,

the number of moles of Ca2+ in the hard water is 0.000414992 mol

Add a comment
Know the answer?
Add Answer to:
Answer units Save Question 7 (10 points) A 100.00 mL sample of hard water is to...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • 6. (8) A 50.0 mL sample of hard water containing Ca2 was titrated with 0.0500 M...

    6. (8) A 50.0 mL sample of hard water containing Ca2 was titrated with 0.0500 M EDTA standard solution at pH 10 and with Eriochrome Black T indicator. The endpoint was reached when 11.35 mL of EDTA was added a) (6) Calculate the concentration of Ca* in the unknown sample in moles per liter (M). b) (2) What is the pCa of the solution?

  • Name Section Experiment 28 Advance Study Assignment: Determination of the Hardness of Water 1. A 0.3946...

    Name Section Experiment 28 Advance Study Assignment: Determination of the Hardness of Water 1. A 0.3946 g sample of Caco, is dissolved in 12 M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. a. How many moles of Caco, are used (formula mass = 100.1)? moles b. What is the molarity of the Ca2+ in the 250 mL of solution? c. How many moles of Caare in a 25.00-mL aliquot of the solution in...

  • Chapter 15 Determination of the Hardness of Water 3, A 100-mL. sample of hard water is...

    Chapter 15 Determination of the Hardness of Water 3, A 100-mL. sample of hard water is titrated with the EDTA solution in Problem 2. The same amount of Mg' is added as previously, and the volume of EDTA required is 31.84 mL a What volume of EDTA is used in titrating the Ca" in the hard water? mL h How many moles of EDTA are there in that volume? moles c. How many moles of Ca are there in the...

  • A titration was performed to standardize an EDTA solution. a) A 25.00 mL aliquot of a...

    A titration was performed to standardize an EDTA solution. a) A 25.00 mL aliquot of a standard solution containing 0.01500 M Ca2+ required 42.87 mL of EDTA to reach the endpoint. The molarity of the EDTA solution is: ________ M b) That same EDTA solution was then used to titrate an unknown hard water sample. A 40.00 mL aliquot of unknown hard water required 34.21 mL of EDTA solution to reach a distinct endpoint. The concentration of Ca2+ ions (assuming...

  • 1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA...

    1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solution. What is the EDTA molarity? 2. A 250.0 mL water sample requires 30.85 mL of the EDTA solution from question 1 to reach the calmagite endpoint. What was the molarity of the hard metal ions in the water sample? 3. If the metal ions in the water sample of question 2 are assumed to be Ca2+ from CaCO3, express the concentration in ppm...

  • 7. A small amount of CuSO4*5H20 (0.973 g) was dissolved in 100.0 mL of water, When...

    7. A small amount of CuSO4*5H20 (0.973 g) was dissolved in 100.0 mL of water, When a 10.0 mL aliquot was titrated with EDTA, the endpoint was reached at 38.05 mL. A 10.0 mL aliquot of a 100.00 mL sample of unknown copper solution was also titrated with the same solution of EDTA. The endpoint was reached at 35.23 mL. What is the mass of Cu?' in the unknown solution?

  • Water Hardness by EDTA Titration Objective: To determine [Ca2+,MG2+] and [Mg2+] concentration in an unknown water...

    Water Hardness by EDTA Titration Objective: To determine [Ca2+,MG2+] and [Mg2+] concentration in an unknown water sample A 0.0107 molarity solution of EDTA is prepared for the experiment. 25 mL of an unknown is pipetted and diluted 100 mL with distilled water and adjusted to a pH between 8 and 10 with NH4OH. A 10.00 mL portion of the diluted unknown is transferred to a 250 mL flask with 3 mL of pH 10 ammonia buffer and tiny amount of...

  • 10.6 10.00 mL of a sample of a solution containing Feand Co are added to 100...

    10.6 10.00 mL of a sample of a solution containing Feand Co are added to 100 mL of pH 4.5 buffer and then titrated to a Cu-PAN endpoint with 18.82 mL of 0.05106 M EDTA. Then, 25.00 mL of the same of the same solution are added to 100 mL of pH 4.5 buffer along with 10 mL of 1 M potassium fluoride, which is added to mask the Fe'. This solution was titrated to a Cu-PAN endpoint with 13.40...

  • Question 4 (1 point) An indirect EDTA titration was performed on a water sample to determine...

    Question 4 (1 point) An indirect EDTA titration was performed on a water sample to determine the sulfate content. First, the analyst measured the hardness of the water by directly titrating a 50 mL aliquot with 0.00515 M EDTA. If it took 14.40 mL of the EDTA solution to reach the endpoint, what is the hardness, or concentration (in M) of metals in the water sample?

  • PRE-LABORATORY QUESTIONS, WATER: DETERMINING THE CONCENTRATION OF CALCIUM IONS IN WATER SAMPLES EXPT. SA HARD Prior...

    PRE-LABORATORY QUESTIONS, WATER: DETERMINING THE CONCENTRATION OF CALCIUM IONS IN WATER SAMPLES EXPT. SA HARD Prior to coming to lab, carefully read the entire experimental procedure that follows and write an outline of the procedure in your lab notebook IN YOUR OWN WORDS (do not simply copy). Then, add three tables for your titrations of the blank, tap water, and CaCl samples. Complete these problems and hand in gt the bexinning of the laboratory period. Show all work. EDTA is...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT