1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
antiseptic1488 [7]
3 years ago
8

A 0.7834 g sample of a primary standard KHP was titrated with 38.45 mL of NaOH solution to a phenolphthalein end-point. What is

the molarity of the NaOH solution?
Chemistry
1 answer:
Zinaida [17]3 years ago
6 0

Answer:

0.0998 M

Explanation:

KHP is a weak <em>monoprotic</em> acid. This means that t<u>he moles of acid are equal to the moles of OH⁻ that were added in the titration</u>.

KHP Molecular weight = 204.22 g/mol

  • moles KHP = 0.7834 g ÷ 204.22 g/mol = 3.836x10⁻³ mol KHP

So  3.836x10⁻³ moles of OH⁻ were added in the titration. With moles and volume we can <u>calculate the molarity of the NaOH solution</u>:

38.45 mL ⇒ 38.45/1000 = 0.03845 L

  • 3.836x10⁻³ mol OH⁻ / 0.03845 L = 0.0998 M
You might be interested in
Which of the following is true about neutrons?
Alja [10]
D is the only choice here that is appropriate given neutrons' lack of charge
5 0
3 years ago
Trying to take the ged test please help me I’m stuck
JulsSmile [24]

Answer: C) Either benzene or oxygen may limit the amount of product that can be formed

Explanation: Benzene and oxygen are the reactants of the equation. What type and the amount of reactants there are in a chemical reaction affects the outcome. Therefore, seeing as benzene and oxygen are the reactants, the answer is C).

3 0
3 years ago
For the Earth's atmosphere, section number two in the pie graph BEST represents the percentage of A) argon B) oxygen C) nitrogen
larisa86 [58]

-<u><em>Oxygen</em></u>

According to Google these are the percentages of the <em>Earths Atmosphere</em>

<em>1</em> 78% - Nitrogen

<u>2</u> 21% - Oxygen

<em>3</em> 0.9% - Argon

<em>4 </em>0.3 - Carbon Dioxide with very small percentage of other elements.

3 0
3 years ago
At what point on the hill will the car have zero gravitational potential energy? A) Half-way down the hill. B) At the top of the
kompoz [17]

I think it’s c cause height is what determines gravitational potential energy

3 0
3 years ago
Read 2 more answers
A 2.912 g sample of a compounds containing only C, H, and O was completely oxidized in a reaction that yielded 3.123 g of water
Taya2010 [7]

Answer:

Explanation:

18 gram of water contains 2 g of hydrogen

3.123 gram of water will contain 2 x 3.123 / 18 = .347 g of hydrogen .

44 gram of carbon dioxide contains 12 g of carbon

7.691 gram of carbon dioxide will contain 12 x 7.691 / 44 = 2.1 g of carbon .

So the sample will contain 2.912 - ( .347 + 2.1 ) g of oxygen .

= .465 g of oxygen .

moles of Carbon = 2.1 / 12 = .175

moles of hydrogen = .347 / 1 = .347

moles of oxygen = .465 / 16 = .029

Ratio of moles of carbon , oxygen and hydrogen ( C,O,H )

= 0.175 : 0.029 : 0.347

= .175/ .029 : 1 : .347 / .029

= 6 : 1 : 12

So empirical formula = C₆H₁₂O

Let the molecular formula be (C_6H_{12}O)_n

molecular weight = n ( 6 x 12 + 12x 1 + 16)

= 100 n

Given 100 n = 100.1

n = 1

Molecular formula = C₆H₁₂O.

3 0
2 years ago
Other questions:
  • 294 g of potassium dichromate contains 52 g of chromium and 39 g of potassium. What is the mass percent of oxygen in the compoun
    11·1 answer
  • A meteor contains 0.556 g of pb-206 to every 1.00 g of u-238. assuming that the meteor did not contain any pb-206 at the time of
    14·1 answer
  • Devon noticed that it has rained more this year than it did in each of the previous 10 years. How might this increase in rainfal
    11·1 answer
  • How can crossing over lead to the expression Of new traits
    13·1 answer
  • How many grams of N are in 30 grams of NO
    12·1 answer
  • Which organelle is found in photosynthetic organisms and captures energy from the sun?
    8·2 answers
  • Nonpolar materials have separated positive and negative areas.<br><br> True<br> False
    9·1 answer
  • Which measurement is a object mass
    9·2 answers
  • Anybody know how I can get the answers from a Y o u t u b e video that’s an hour and 54 mins long without actually watching it?
    9·1 answer
  • Consider the following genotype Yy Ss Hh
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!