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
fredd [130]
2 years ago
9

Suppose that a 10-mL sample of a solution is to be tested for I− ion by addition of 1 drop (0.2 mL) of 0.13 M Pb(NO3)2.

Chemistry
1 answer:
Liono4ka [1.6K]2 years ago
8 0

The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

<u>Given data : </u>

Volume of solution to be tested for I-ion = 10 mL

Volume of  Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

<h3>Determine the number of I that must be present </h3>

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions =  ( molarity of Pb(NO₃)₂ * volume of  Pb(NO₃)₂ ) / ( total volume )

                              = ( 0.13 * 0.2 ) / ( 10 + 0.2 )

                              = ( 0.026 ) / ( 10.2 )  = 0.002549 M

Next step :<u> </u><u>determine the</u><u> molarity of  I</u>

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq)  + 2I (aq)

also;  Ksp = [ Pb²⁺ ] [ I ]²  ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

      = 0.0018 M

Final step :<u> Determine the minimum number of grams of I </u>

moles of I = molarity of I * total volume

                 = 0.0018 M * 10.2 mL

                 = 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Learn more about Pb(NO₃)₂ : brainly.com/question/25071409

You might be interested in
The amino acids are combinations of
aalyn [17]

Answer:  The correct answer is:  [B]:

_________________________________________________

                         " organic acid and amines " .

_________________________________________________

<u>Note</u>:  Choice B:  "organic acid and amines" ;

            is the only answer choice that contains "amines" (hint: <u> amin</u><u>o acid</u> / <u>amin</u><u>e)</u> ;  which are "proteins" .

           As such;  Choice "B" is the <u><em>only</em></u>  correct answer choice.

_____________________________________________________

Hope this helps!

    Best wishes to you!

_____________________________________________________

5 0
3 years ago
Read 2 more answers
Skin cells _____.
Gekata [30.6K]

Hey, the two answers that would best fit in the blank would be B.) reproduce by mitosis & D.) Have 46 chromosome pairs.


Sentence form: Skin cells reproduce by mitosis and have 46 chromosome pairs.

5 0
3 years ago
Identify two ways that temperature plays a role in chemical changes.
sergejj [24]

Answer:

Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.

Explanation:

3 0
3 years ago
Kjnlnkljnljknjnjjnjnjnjnjnnjnj
My name is Ann [436]
Lajdhskskdhskhdksnsjsndjs
6 0
3 years ago
The two most abundant elements in earth's core are ?
vesna_86 [32]
The two most abundant elements in Earths core are Iron and Nickel.

Hope this helps!
3 0
3 years ago
Read 2 more answers
Other questions:
  • Please help me i dont understand this!
    11·1 answer
  • A lack of sewage structures in overcrowded cities may lead to __________.
    13·2 answers
  • What volume of oxygen gas, in milliliters, is required to react with 0.640 g of SO2 gas at STP?
    13·2 answers
  • Plzz some one tell me tha objection 5 6 points to kekule formula
    7·1 answer
  • Pls explain ionization energy​
    12·1 answer
  • A crime-scene is roped off with yellow tape. The rectangular area is 5.6 meters long 10.75 meters wide. What is the area of the
    15·1 answer
  • Calculate the value deltaG°​
    6·1 answer
  • 76. Which of the following choices is not an example of an adaptation?
    12·1 answer
  • How many moles are in 272 grams of hydrogen peroxide (H2O2) ?
    5·1 answer
  • A chemist dissolves 43.3 g Li2S (MM: 45.95 g/mol) to make 0.500 L of solution.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!