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
SVETLANKA909090 [29]
3 years ago
12

A 5.40 mL sample of an H3PO4 solution of unknown concentration is titrated with a 5.000×10−2 M NaOH solution. A volume of 7.02 m

L of the NaOH solution was required to reach the equivalence point.
What is the concentration of the unknown H3PO4 solution?
Express your answer using four significant figures.
Chemistry
1 answer:
uysha [10]3 years ago
8 0

Answer:

0.02167 M

Explanation:

At first we need balanced equation

3NaOH + H3PO4 = Na3PO4 + 3H2O

This means for every 3 moles of NaOH we have 1mol of H3PO4.

At equivalence point we have equal moles of both titrant and analyte in our case H3PO4 and NaOH. start by finding the moles of NaOH

Molarity= moles/Litres

0.05= y/0.00702

x= 3.51x10^-4 moles

But keep in mind the balanced equation that says for every 3 moles of NaOH we have 1mol of H3PO4

so we divide by 3 moles to get moles of h3po4.

3.51x10^-4 moles NaOH x 1mol of H3Po4/3moles of NaOH

= 1.17x10^-4 moles of H3PO4

to find the molarity then use the forumla above

M = moles/litres

= 1.17x10^-4/0.0054

= 0.02167 M

You might be interested in
The first liquid that comes out of a woman's breast after delivery is called?<br>​
Kay [80]
The answer is: Colostrum
5 0
3 years ago
Read 2 more answers
A vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa. determine the absolute
stealth61 [152]

Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the  absolute pressure in the chamber and express is 57kpa

Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure

Here to find absolute pressure atmospheric pressure=92kpa and  vacuum gage=35 kpa                                      

Pabsolute pressure=Patmospehric pressure - Pvaccume

92-35=57kpa

Know more about absolute pressure

brainly.com/question/28498660

#SPJ4

6 0
2 years ago
Which characteristic do electronegativity differences indicate about reactions between atoms
emmasim [6.3K]
O valence electron number is the answer
6 0
3 years ago
ompare your TLC analysis with the results of the column chromatography. More polar molecules move more slowly through silica tha
Assoli18 [71]

Biphenyl will have a higher R value than the Methyl Orange.

Explanation:

Biphenyl is a aromatic hydrocarbon and it is a nonpolar molecule.

Methyl Orange is a organic compound with a -SO₃⁻Na⁺ polar functional group which will induce a high polarity in the compound.

You may find the chemical structures of both molecules in the attached picture.

Column chromatography, which use as stationary phase silica gel, is a good technique for separation of the Methyl Orange from Biphenyl.

Being a non-polar molecule,  Biphenyl will have a higher R value than the Methyl Orange.

To separate them you use a appropriate solvent as eluent, as exemple chloroform, and Biphenyl will elute first from the column and after that, as a separate phase, Methyl Orange will elute thus separating them.

Learn more about:

chromatography

brainly.com/question/10296715

#learnwithBrainly

7 0
3 years ago
What is the smallest halogen atom<br>​
ad-work [718]
The smallest halogen atom is fluorine
4 0
2 years ago
Read 2 more answers
Other questions:
  • What is the mass of a box of nails
    8·1 answer
  • Which direction does the red end of the needle of a compass point?
    10·1 answer
  • Which group iia metal magnesium or calcium is more active cite your evidence?
    8·1 answer
  • What is Earth’s motion around the sun in a path called<br><br> answer is rotation
    14·2 answers
  • Eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee question in picture
    15·1 answer
  • Part a what is the concentration of k+ in 0.15 m of k2s? express your answer to one decimal place and include the appropriate un
    6·2 answers
  • What is the mass of 2 moles of 238U?
    11·1 answer
  • . Photosynthesis and cellular respiration are two processes that help drive Earth's carbon cycle. Which f the following statemen
    8·2 answers
  • If a calm person with a lung capacity of 3.5 liters and a body temperature of 360 C gets angry, what will the volume of the pers
    8·1 answer
  • In this equation, what should be the coefficients of the reactants and products?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!