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UkoKoshka [18]
3 years ago
6

If you had to make up an instrument that doesn't exist. What would it be?

SAT
1 answer:
Anna [14]3 years ago
8 0

Answer:

every instrument put together in one big mess

Explanation:

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A 20.0-ml sample of a 0.200 mhbr solution is titrated with a 0.200 mnaoh solution. calculate the ph of the solution after the fo
kumpel [21]

The calculated pH of the solutions are given below:

  • The pH of the solution after 14.0 ml of base is added to it is calculated as 1.45.
  • The pH of the solution after 19.8 ml of base is added to it is calculated as 3.0
  • The pH of the solution after 20.0 ml of base is added to it is calculated as 7.

<h3>What is pH?</h3>

This is the level of acidity or alkalinity of an aqueous solution. The pH of a substances tells if its an acid, base or neutral.

HBr and NaOH while in water would dissociate and they would become H+ and OH- respectively.

Mol of HBr = Mol * Vol

= 0.200 * 20mL

= 4 mmol

A. Moles of NaOH added

= 0.2 X 14

= 2.8 mmol

Moles of H+ that did not react

= 4 - 2.8

= 1.2 mmol

1.2/1000 = 0.0012 moles

Total volume = 20 + 14

= 34 mL to litres

= 0.034 L

Molarity of H+ = 0.0012 / 0.034L

= 0.035 M

-log[0.035] = 1.45

The pH of the solution is  1.45

B. NaOH added = 19.8 * 0.2 =

3.96 mmoles

The unreacted solution

= 4.0 - 3.96

= 0.04 mmol

0.04/1000 = 0.00004 moles

Total volume = 20 + 19.8

= 39.8mL

Converted to litres = 0.0398L

Molarity  = 0.00004 / 0.0398L

= 0.001

-log(0.001) = 3.0

The ph Is therefore 3.0

C. Moles of NaOH added = 0.2*20mL = 4mmol

All the H+ are going to be consumed here. This would result into a neutral solution pH = 7

<u>Complete question:</u>

20.0 mL sample of 0.200 M HBr solution is titrated with 0.200 M NaOH solution. Calculate the PH of the solution after the following volumes of base have been added.

A. 14.0 mL

B. 19.8 mL

C. 20.0 mL

Read more on pH here; brainly.com/question/22390063

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2 years ago
Describe how vacation stress may negatively affect your family life
SCORPION-xisa [38]
Arguments, poor communication skills
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2 years ago
Which support services career is characterized by designing, building, and maintaining medical machinery?
ololo11 [35]

Answer:

B. biomedical support services

Explanation:

The support services career that is characterized by designing, building, and maintaining medical machinery is the biomedical support services.

Generally, biomedical support services is a field of medicine saddled with the responsibility of providing services ranging from the design of medical equipments, construction (building) of medical machinery, installation of these machines to the maintenance and repair of medical machinery (equipment).

The group of experts or professionals who are employed to provide biomedical support services to hospitals, clinics or other medical facilities are generally referred to as biomedical engineers.

5 0
3 years ago
Advantage of series combination of cell​
umka21 [38]

Explanation:

<h3 /><h3>Advantages of series combination:</h3>

  • Cells connected in series give a greater resultant voltage than individual cells.

  • Voltage increases if the number of cells increases.

  • Series circuits do not overheat easily.

Hope it helpz~

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2 years ago
Which graph represents the relationship between volume and kelvin temperature for an ideal gas at constant pressure?.
svp [43]

Answer:

First graph

Explanation:

4 0
2 years ago
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