What nation has attempted to drill through Earth's crust?

A 50.00 mL sample of groundwater is titrated with 0.0800 M EDTA . If 10.90 mL of EDTA is required to titrate the 50.00 mL sample

vitfil [10]

Answer:

0.01744 M is the hardness of the groundwater.

1,744 ppm is the hardness of the groundwater in parts per million of calcium carbonate by mass.

Explanation:

$Ca(In)^{2+}(red)+EDTA\rightarrow Ca(EDTA)^{2+}+In(blue)$

In = Indicator

Concentration of calcium ion in groud water = $C_1=?$

Volume of ground water = $V_1=50.00 mL$

Concentration of EDTA solution = $C_2=0.0800 M$

Volume of EDTA solution = $V_2=10.90 mL$

$C_1V_1=C_2V_2$

$C_1=\frac{C_2V_2}{V_1}=\frac{0.0800 M\times 10.90 mL}{50.00 mL}=0.01744 M$

$CaCO_3(sq)\rightarrow Ca^{2+}(aq)+CO_3^{2-}(aq)$

$[CaCO_3]=[Ca^{2+}]$

So. $[CaCO_3]=0.01744 M$

0.01744 M is the hardness of the groundwater.

0.01744 Moles of calcium carbonate are present in 1 Liter of solution.

Mass of 0.01744 moles of calcium carbonate =

$0.01744 mol\times 100=1.744 g$

1 g = 1000 g

1.744 g = 1.744 × 1000 mg = 1,744 mg

$ppm=\frac{\text{Mass of solute) mg)}}{\text{Volume of solution}{L}}$

The hardness of the groundwater in parts per million :

$\frac{1,744 mg}{1 L}= 1,744$

1,744 ppm is the hardness of the groundwater in parts per million of calcium carbonate by mass.

4 0

3 years ago

7. Do you have any reservations about taking this course? Explain. How can I help?

Pavel [41]

Answer:

Reservations means to say, are there any thoughts you have about this course that are negative. And what can your teacher do to help you excel, or succeed in this course. Good luck to you, and remember to take deep breathes when you need a break.

Explanation:

3 0

3 years ago

Where are most of the nonmetals found in the periodic table?. . A.. at the top. . B.. on the right side. . C.. in the bottom lef

mote1985 [20]

The correct answer among the choices listed is option B. Most of the nonmetals found are found in the right side of the periodic table. There are seventeen nonmetal elements that can found on that side. Nonmetal elements are poor conductors of heat and electricity.

6 0

3 years ago

Answer, please!!!!!!

pshichka [43]

Answer:

C. SOIL THAT IS A MIXTURE OF STILT AND CLAY

PLS MAKE ME BRAINLEST!

5 0

3 years ago

Which of the following processes absorbs energy? A) condensation of water on a wind shield of a car B) formation of copperC) bal

Alecsey [184]

Answer:

C) ball rollinflown a hill

Explanation:

The question asks to identify the endothermic process in the list of options. By way of elimination, we have;

A) condensation of water on a wind shield of a car

Condensation is an exothermic process. That is, heat is given out as the gases change into the liquid state of matter.

B) formation of copper

This is an exothermic process. Capture of electrons by a cation is always exothermic.

C) ball rollinflown a hill

This is the correct option. Energy is absorbed by the ball as it moves on the hill

D) formation of ice from liquid water

Freezing is an example of exothermic reaction. Heat is given off to the surroundings.

E) oxide from copper and oxygen

Formation of metal oxides and most reactions involving oxygen are exothermic reactions,

4 0

3 years ago