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
lesya692 [45]
3 years ago
6

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

its. 0.3 m submithintsmy answersgive upreview part correct part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion. submithintsmy answersgive upreview part correct part c a scientist wants to make a solution of tribasic sodium phosphate, na3po4, for a laboratory experiment. how many grams of na3po4 will be needed to produce 650. ml of a solution that has a concentration of na+ ions of 1.30 m ?

Chemistry
2 answers:
Olin [163]3 years ago
7 0

1) Answer is: the concentration of potassium cations (K⁺) is 0.3 M.

Balanced chemical reaction (dissociation) of potassium sulfide in the water:

K₂S(aq) → 2K⁺(aq) + S²⁻(aq).

c(K₂S) = 0.15 M.

From balanced reaction: n(K₂S) : n(K⁺) = 1 : 2, because volume of the solution is constant: c(K⁺) = 2 · c(K₂S).

c(K⁺) = 0.3 M; concentration of potassium cations.

2) Answer is: its concentration is half that of the Cl⁻ ion.

Balanced chemical reaction (dissociation) of calcium chloride (CaCl₂) in the water:

CaCl₂(aq) → Ca²⁺(aq) + 2Cl⁻(aq).

From balanced reaction: n(Ca²⁺) : n(Cl⁻) = 1 : 2, because volume of the solution is constant: c(Ca²⁺) = c(Cl⁻) ÷ 2.

n is amount of the substance.

3) Answer is: 46.176 grams of Na₃PO₄ will be needed.

Balanced chemical reaction (dissociation) of sodium phosphate  (Na₃PO₄) in the water:

Na₃PO₄(aq) → 3Na⁺(aq) + PO₄³⁻(aq).

V = 650 mL ÷ 1000 mL.

V = 0.650 L; volume of the solution.

c(Na⁺) = 1.3 M; concentratium of sodium cations.

From balanced reaction: n(Na₃PO₄) : n(Na⁺) = 1 : 3, because volume of the solution is constant: c(Na₃PO₄) = c(Na⁺) ÷ 3.

c(Na₃PO₄) = 1.3 M ÷ 3.

c(Na₃PO₄) = 0.43 M.

n(Na₃PO₄) = c(Na₃PO₄) · V(solution).

n(Na₃PO₄) = 0.43 M · 0.65 L.

n(Na₃PO₄) = 0.281 mol.

m(Na₃PO₄) = n(Na₃PO₄) · M(Na₃PO₄).

m(Na₃PO₄) = 0.281 mol · 163.94 g/mol.

m(Na₃PO₄) = 46.176 g.

Anon25 [30]3 years ago
4 0

1. Concentration K⁺ = [K⁺] = 0.3 M

2. Ca²⁺concentration is half that of the Cl⁻ ion.

3. 45,838 grams of Na₃PO₄ will be needed

<h3><em>Further explanation</em></h3>

Stokiometry in Chemistry studies about chemical reactions mainly emphasizing quantitative, such as the calculation of volume, mass, amount, which is related to the number of ions, molecules, elements, etc.

Reaction equations are chemical formulas for reagents and product substances

Reaction coefficients are numbers in the chemical formula of substances involved in the reaction equation. Reaction coefficients are useful for balancing reagents and products.

The reaction coefficient shows the ratio of the number of moles or molecules of the reacting substance

The ionization reaction is the reaction of the decomposition of a substance into its ions when the substance is dissolved in water.

Molarity (M)

Molarity shows the number of moles of solute in every 1 liter of solution.

\large {\boxed{\bold {M ~ = ~ \frac {n} {V}}}

Where

M = Molarity

n = Number of moles of solute

V = volume of the solution

  • 1. The decomposition / ionization reaction of K₂S is

K₂S(aq) ----> 2K⁺ (aq) + S²⁻ (aq)

Comparison of reaction coefficients = mole ratio = concentration ratio for the same volume, so

K₂S coefficient: coefficient 2K⁺ = 1: 2

[K⁺] = 2. [K₂S]

[K⁺] = 2. 0.15 M

[K⁺] = 0.3 M

  • 2. The decomposition / ionization reaction of CaCl₂ is

CaCl₂ -> Ca²⁺ + 2Cl⁻

Same as the explanation in point 1:

coefficient Ca²⁺: coefficient Cl⁻= 1: 2

so that

 [Ca²⁺] = 1/2 [Cl⁻]

[Ca²⁺] half of the concentration [Cl⁻]

  • 3. Decomposition / ionization reactions from Na₃PO₄

Na₃PO₄ ---> 3Na + + PO₄³⁻

[Na₃PO₄] = 1/3. [Na +]

[Na₃PO₄] = 1/3. 1.3

[Na₃PO₄] = 0.43 M

then the number of moles is

mol = M. vol

mole = 0.43. 0.65 L

mole = 0.2795

 So that its mass:

molar mass of Na₃PO₄ = 164 g / mol

mass = mole. molar mass

mass = 0.2795. 164

mass = 45,838 grams

<h3><em>Learn more</em></h3>

grams of hydrogen

brainly.com/question/4277430

grams of calcium chloride

brainly.com/question/9945440

sample of H₃PO₄ solution

brainly.com/question/9850829

Keywords: ionization, molar mass, mole, mass, Na₃PO₄, K₂S, CaCl₂

You might be interested in
HELPPPPP!!!!
Margarita [4]

Answer:

sound waves travel.faster through materials that are more dense

8 0
3 years ago
Read 2 more answers
S this statement true or false? All worms belong to the same phylum.
telo118 [61]

Answer:

FALSE.

Explanation:

The right answer is false. There are three different groups of phylum for worms.

Hope this helped!

8 0
3 years ago
Read 2 more answers
Given the following UNBALANCED reaction: NH3 (g) &lt;--&gt; N2 (g) + H2 (g) If 1
Yakvenalex [24]

Answer:

C. 1.35

Explanation:

                                                     2NH3 (g) <-->          N2 (g) +             3H2 (g)

Initial concentration                2.2 mol/0.95L       1.1 mol/0.95L           0

change in concentration        2x                             x                           3x

                                                 -0.84 M                  +0.42M                +1.26M

Equilibrium                       1.4 mol/0.95L=1.47M        1.58 M                   1.26 M

concentration

Change in concentration(NH3) = (2.2-1.4)mol/0.95 L = 0.84M

Equilibrium concentration (N2) = 1.1/0.95 +0.42=1.58 M

Equilibrium concentration(NH3) = 1.4/0.95 = 1.47M

K = [N2]*{H2]/[NH3] = 1.58M*1.26M/1.47M = 1.35 M

8 0
2 years ago
Alka-seltzer is an antacid that is dissolved in water before use. for an experiment, three tablets of alka-seltzer are dissolved
Naddika [18.5K]

Alka-seltzer in an antacid that contains a mixture of sodium bicarbonate and citric acid. When the tablet is dissolved in water, the reactants which are in solid form in tablet become aqueous and react with each other.

During this reaction, Carbon Dioxide gas is evolved which causes the reaction mixture to fizz. The equation is given below.

NaHCO_{3}\ (aq) +  H_{3}C_{6}H_{5}O_{7} (aq)\rightarrow Na_{3}C_{6}H_{5}O_{7}(aq)+ CO_{2}(g)+H_{2}O (l)

Rate of the above reaction is affected by the Temperature.

As the temperature increases , the rate of the reaction increases. This happens because at higher temperature, the collisions between reacting species are more which result in formation of product in less time. This increases the rate of reaction.

We have been given equal volumes of water for each beaker. But the temperature of beaker c is 80°C which is the highest temperature. That means the reaction in beaker c is fastest.

Whereas beaker a is at lowest temperature (30°C) , therefore the reaction in beaker a would be slowest .

Therefore the answer that correctly orders the reaction rates from fastest to slowest reaction is beaker c > beaker b > beaker a

8 0
3 years ago
(I have a chemistry study guide that confuses me, anything will help!!!)
krek1111 [17]
4) Example of physical properties: colour, Smell, texture, boiling and melting point density and viscosity.

11) Cations are formed when positively-charged ions and anions negatively-charged ions are formed when a metal loses electrons, and a nonmetal gains those electrons. The electrostatic attraction between the positives and negatives brings the particles together and creates an ionic compound, such as sodium chloride.

12) Quantum mechanical model: The Quantum Mechanical Model. ... The quantum mechanical model of the atom uses complex shapes of orbitals (sometimes called electron clouds), volumes of space in which there is likely to be an electron.

Hope these helped!
3 0
2 years ago
Other questions:
  • Computer model that usually shows a process is called
    6·1 answer
  • Which sentence best describes how scientists plan out their experiments?
    11·2 answers
  • Which of the following is NOT a type of energy conversion process?
    9·2 answers
  • a car is traveling at a speed of 55 mph the speed increased to 75 mph if the time needed to hange its speed is 4 seconds whats t
    12·1 answer
  • Can the nature of a reactant be altered to speed up reaction
    8·1 answer
  • Un deportista de 72 kg trepa por una cuerda hasta una altura de 12m. Calcula el incremento de energía potencial gravitatoria que
    12·1 answer
  • 50 points for 2 questions and brainliest! Please help!!!!
    10·1 answer
  • · Explain electromeric effect.​
    12·1 answer
  • Crude oil may contain hundreds of different types of hydrocarbons. Some examples include: Butane(C4H10) Dodecane (C12H26) Octane
    15·1 answer
  • The length breadth and thickness of a brick is 18cm 8 cm and 5cm respictively find the area of the widest part of rhe brick​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!