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
mixas84 [53]
3 years ago
6

A 25.0 mL NaOH solution of unknown concentration was titrated with a 0.189 M HCl solution. 19.6 mL HCl was required to reach the

equivalence point. In a separate titration, a 10.0 mL H3PO4 solution was titrated with the same NaOH solution. This time, 34.9 mL NaOH was required to reach the equivalence point. What is the concentration of the H3PO4 solution
Chemistry
1 answer:
butalik [34]3 years ago
5 0

Answer:

0.172 M

Explanation:

The reaction for the first titration is:

  • HCl + NaOH → NaCl + H₂O

First we <u>calculate how many HCl moles reacted</u>, using the <em>given concentration and volume</em>:

  • 19.6 mL * 0.189 M = 3.704 mmol HCl

As one HCl mol reacts with one NaOH mol, <em>there are 3.704 NaOH mmoles in 25.0 mL of solution</em>. With that in mind we <u>determine the NaOH solution concentration</u>:

  • 3.704 mmol / 25.0 mL = 0.148 M

As for the second titration:

  • H₃PO₄ + 3NaOH → Na₃PO₄ + 3H₂O

We <u>determine how many NaOH moles reacted</u>:

  • 34.9 mL * 0.148 M = 5.165 mmol NaOH

Then we <u>convert NaOH moles into H₃PO₄ moles</u>, using the <em>stoichiometric coefficients</em>:

  • 5.165 mmol NaOH * \frac{1mmolH_3PO_4}{3mmolNaOH} = 1.722 mmol H₃PO₄

Finally we <u>determine the H₃PO₄ solution concentration</u>:

  • 1.722 mmol / 10.0 mL = 0.172 M
You might be interested in
State and explain the observations when chlorine gas is bubbled through a solution of
natta225 [31]

Answer:

A reduction-oxidation (redox) reaction will occur.

Chlorine gas (Cl2) will accept electrons to form Cl- ions.

The Iron(II) ions (Fe2+) will lose electrons to form Fe3+ ions. (Iron (III) ions)

Fe2+ ions are green, while Fe3+ ions are yellow,

so the observation will be the solution turning from green to yellow.

5 0
3 years ago
Referring to the experiment in which the scientists studies how long it
pshichka [43]

Answer:

different sizes of the parachute

Explanation:

this is what is being changed throughout the experiment

4 0
2 years ago
Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.
geniusboy [140]
No' of molecules divide by avogadro number , 6×6.023×10^23 so (2.2×10^22)÷(6.023×10^23)
= 0.03653 moles
moles × Molar mass = mass
n×Mr=m
0.03653×40 = 1.46 grams
8 0
3 years ago
Read 2 more answers
Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0
ser-zykov [4K]
Shdhdhdhdhdhshshhzshshshdhdhshd
7 0
3 years ago
What is the cation and anion of NaOH
Wewaii [24]

Answer:

naoh is called sodium hydroxide,

Explanation:

hope this helps

6 0
3 years ago
Read 2 more answers
Other questions:
  • How many moles of aluminum metal are needed to produce 3.33 moles of aluminum chloride?
    12·1 answer
  • Some animals only have _______ cells
    5·2 answers
  • Hno3 is an arrhenius
    7·1 answer
  • PLEASE HELP ME PLEASE!!!!!!!!
    6·1 answer
  • PLEASE HELP ME I DONT WANT TO FAIL
    11·1 answer
  • I need help please....
    9·2 answers
  • Ralph conducted an experiment to study the effect of temperature change on the heart rate of
    10·1 answer
  • Another name for a renewable energy source
    12·1 answer
  • What is extrapolation?
    5·1 answer
  • Please help me..!!!!!!!!!!!!!
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!