In the titration of 25.00 mL of a water sample, it took 20.840 mL of 4.350x 10−3 M EDTA solution to reach the endpoint. Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3 significant figures)9.07×10-5 The total hardness is due to one or a combination of Ca2+, Mg2+, and Fe2+ in your sample. It is convenient to express this hardness as though it was entirely due to Ca2+. Making this assumption, determine the number of moles of Ca2+ present in the bottled water sample titrated. (enter your answer with 3 significant figures) he total hardness is always listed in parts-per-million (ppm) of CaCO3 (or mg CaCO3 / Kg H2O). Since the density of water is 1.0 g/mL, one ppm would be the same as the number of mg of CaCO3 per liter of water. Determine the number of moles of CaCO3 present in the titrated sample of water, assuming that all the Ca2+ combines with CO32−. (enter your answer with 3 significant figures)

Question
Asked Sep 24, 2019
61 views

In the titration of 25.00 mL of a water sample, it took 20.840 mL of 4.350x 10−3 M EDTA solution to reach the endpoint.

 

Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3 significant figures)

9.07×10-5

 

The total hardness is due to one or a combination of Ca2+, Mg2+, and Fe2+ in your sample. It is convenient to express this hardness as though it was entirely due to Ca2+. Making this assumption, determine the number of moles of Ca2+ present in the bottled water sample titrated. (enter your answer with 3 significant figures)

 

he total hardness is always listed in parts-per-million (ppm) of CaCO3 (or mg CaCO3 / Kg H2O). Since the density of water is 1.0 g/mL, one ppm would be the same as the number of mg of CaCO3 per liter of water. Determine the number of moles of CaCO3 present in the titrated sample of water, assuming that all the Ca2+ combines with CO32−. (enter your answer with 3 significant figures)

check_circle

Expert Answer

star
star
star
star
star
1 Rating
Step 1

The molarity of a solution is the ratio of number of moles of a substance to the volume of solution in liters. The expression for molarity is labelled in equation (1) in which M is the molarity, n is the number of moles and  V is the volume in liters.

The relation between millilitres (mL) and liters (L) is written in equation(2).

help_outline

Image Transcriptionclose

M= V(L) (1) 1L 1000 mL ... (2)

fullscreen
Step 2

Convert 20.840 mL in L by using the equation (2) as shown below.

help_outline

Image Transcriptionclose

1 L 20.840 mL-20.840 mL 1000 mL 0.02084 L

fullscreen
Step 3

The number of moles of EDTA calculated is shown in equation (3) by using equation (...

help_outline

Image Transcriptionclose

4.350x103 (3) 0.02084 L n 9.07x10

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

General Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Silicon nitride (Si3N4) a valuable ceramic, is made by the direct combination of silicon and nitroge...

A: Unbalanced reaction can be written as

question_answer

Q: A soultion of sodium carbonate (Na2CO3(aq)) will react with a solution of calcium chloride (CaCl2(aq...

A: Click to see the answer

question_answer

Q: Review ormation about an electron's probable be represented by an electron-density an orbital. An or...

A: The azimuthal quantum numbers for different orbitals are given below.s-orbital ------> l=0p-orbit...

question_answer

Q: A 49 kg sample of water absorbs 358 kJ of heat. If the water was initially at 28.4 ∘C, what is its f...

A: The final temperature is calculated using the given formula,

question_answer

Q: Which of the following solutes has the greatest effect on the colligative properties for a given mas...

A: Colligative properties are those properties which depends on the ratio of the number of solute parti...

question_answer

Q: How many grams of water(18g/mom) would contain 6.54*1024 hydrogen atoms?

A: The number of hydrogen atoms present in one mole of water is calculated as

question_answer

Q: Can someone please explain HOW to do this, not just the answer.   Write the formula for the compound...

A: Given,One potassium, one aluminium with two groups of one sulphur atom and four oxygen atoms and twe...

question_answer

Q: 7. A 2.10-L vessel contains 4.65 g of a gas at 1.00 atm and 27.0°C. (a) Calculate the density of the...

A: The values are given as follows:

question_answer

Q: produced. The balanced equation for this reaction is When potassium hydroxide reacts with phosphoric...

A: The number of moles refers to the ratio of mass to the molar mass of the given compound. The chemica...