Explain the difference between an endpoint and equivalence point in a titration

Answers

Answer 1

Answer:

To know the end point we use phenolphthalein as indicator. Therefore, endpoint is point in which indicator change the color, and equivalence point is point in which there is equal amount of two chemicals.

What is titration?

Titration is a technique by which we know the concentration of unknown solution using titration of this solution with solution whose concentration is known. To know the end point we use phenolphthalein as indicator. End point is a point where completion of reaction happen.

Endpoint is point in which indicator change the color, and equivalence point is point in which there is equal amount of two chemicals. Endpoint is after Equivalence point.

Therefore, endpoint is point in which indicator change the color, and equivalence point is point in which there is equal amount of two chemicals.

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Answer 2

Answer:

Answer:

Endpoint is point in which indicator change the color, and equivalence point is point in which there is equal amount of two chemicals. Endpoint is after Equivalence point.

Explanation:

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If you want to make 0.5 L of a 0.01 M solution of bromine (Br2) in water, how much bromine would you need? A. 0.8 grams. . B. 0.8 moles. . C. 1.6 grams. . D. 1.6 moles.

Solids and liquids have both mass and volume, but a gas has only mass.
a. True
b. False

Answers

True. A gas does not have a definite volume. Therefore, making this statement correct.

Answer:

True. A gas does not have a definite volume. Therefore, making this statement correct.

Explanation:

true

What is a disadvantage of using a space-filling model to show a chemical compound?

Answers

First you have to know what the space-filling model is. The space-filling model is a model used to show the structure of the atoms. It specially shows the relative sizes of the atoms and how the space between atoms (inside the molecule) is filled. It does not show the angles and lengths of the bonds. So, the disadvantage of using a space-filling model to show a chemical compound is that it will not permit to observe neither the angles nor the lengths of the bonds in the molecule.

Answer:

B Space-filling models do not identify the number and type of bonds.

Explanation:

edge test

If the volume and moles of a container are held constant, the temperature of a gas is inversely proportional to the pressure. TRUE
FALSE

Answers

Answer:

FALSE

Explanation:

Assuming that the gas is ideal

Therefore the gas obeys the ideal gas equation

Ideal gas equation is

P × V = n × R × T

where

P is the pressure exerted by the gas

V is the volume occupied by the gas

n is the number of moles of the gas

R is the ideal gas constant

T is the temperature of the gas

Here volume of the gas will be the volume of the container

Given the volume of the container and number of moles of the gas are constant

As R will also be constant, the pressure of the gas will be directly proportional to the temperature of the gas

P ∝ T

∴ Pressure will be directly proportional to the temperature

0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. How do I solve this?

Answers

The concentration of the solution has been 0.17 M.

The molarity has been defined as the moles of solute that has been dissolved in a liter of solution. The molarity of the solution has been expressed as:

$\rm Molarity=(Mass)/(Molar\;mass)\;*\;(1)/(Volume\;(L))$

Computation for Molarity of the solution

The molar mass of sodium chloride solution has been 58.5 g/mol.

The given mass of NaCl in the solution has been 0.5 grams.

The volume of NaCl solution has been 0.05 L.

Substituting the values for molarity of the solution:

$\rm Molarity=(0.5)/(58.5)\;*\;(1)/(0.05\;L)\n\nMolarity=0.17 M$

The concentration of the solution has been 0.17 M. The solution has been prepared by dissolving 0.5 g NaCl in minimal water, and makeup the volume to 0.05 L.

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If you are trying to find the molarity of this solution you first need to find the number of moles of sodium chloride that are present in the 0.5g sample. To do this you need to divide the mass of sodium chloride (0.5g) by its molar mass (58.45g/mol) to get 0.00855mol of sodium chloride. Then you divide the number of moles (0.00855mol) by the volume of solution (0.05L) to get 0.171M (The units for molarity is mol/L). Therefore the solution has a concentration of 0.171M.

I hope this helps. Let me know in the comments if anything was unclear or if you were asking a different question.

Which statements about the formation of the solar system are true and in a correct order? A.
A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects.

B.
Most of the dust and gas contracted into a central mass—the Sun; half the mass of the cloud condensed to form Jupiter; asteroids and comets crashed into the sun to form the smaller planets.

C.
A spinning cloud of dust began to compress to form the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

D.
Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

Answers

The statement about the formation of the solar system that are true and in a correct order are Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets. The answer is letter D.

Maki uses 20 gallons of a solution with an unknown ethanol concentration and 60 gallons of a 12% ethanol solution to make 80 gallons of a 10% solution. What is the value of x, the concentration of the unknown ethanol solution?. a. 0.02.
b. 0.04.
c. 0.05.
d. 0.08

Answers

This question is based on the concept of percentage by mass. Therefore the value of x, concentration of unknown ethanol solution is 4% when 20 gallons of a known solution is used. Option b is correct option

What is percentage by mass?

Mass percentage represents the the percentage of each element that is making a particular compound. Mass percentage does not have any unit as numerator and denominator contains the same unit.

Mathematically,

Percentage of mass = (component’s mass ÷ total mass) x 100%

According to the question the equation can be written as:

20× (x÷ 100) + 60×0.12 = 80× 0.10

x÷5 + 7.2 = 8

x÷ 5 = 0.8

x = 4%

concentration of unknown solution = 4%

Therefore, the value of x, concentration of unknown ethanol solution is 4% when 20 gallons of a solution is used. Option b is correct option

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