Answers
Answer:
(Incomplete question)
Assuming the molarity of the weak acid is 17.4 M, the answer would be 52.4mL.
Explanation:
Equivalence point is defined as the point where moles of titrant = moles of titrand (analyte).
At equivalence point,
# moles of NaOH = # moles of weak acid
# moles of NaOH = 0.1236 × 12.43 mL
= 0.1236 mol/L × 0.01242 L
= 0.00153511 moles of NaOH
= 0.00153511 moles of weak acid.
Since the concentration of acid is not stated in your question, we will assume the concentration of the acid to be 17.4 M.
concentration = no. of moles ÷ volume
⇒ vol. = no. of moles ÷ conc.
= 0.00153511 mol ÷ 17.4 mol/L
= 0.0267 L ≈ 26.7 mL
This means that the total volume of the solution at the half equivalence point will be:
26.7 mL + 26.7 ml
= 52.4 mL.
N.B: Confirm missing variable from question: it could be concentration or volume of acid,but it is impossible to have two unknowns. Also, incase its pH of acid that's given, you can solve problem using Henderson-Hasslebauch equation.
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Answers
A student pipets 5.00 mL of a 5.103 M aqueous NaOH solution into a 250.00 mL volumetric flask and dilutes up to the mark with distilled water. the final molarity of the dilute solution is 0.102 M.
From the question given above, the following data were obtained:
Volume of stock solution (V1) = 5 mL
Molarity of stock solution (M₁) = 5.103 M
Volume of diluted solution (V₂) = 250 mL
Molarity of diluted solution (M₂) =?
The molarity of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
5.103 × 5 = M2 × 250
25.515 = M2 × 250
Divide both side by 250
M2 = 25.515 / 250
M2 = 0.102 M
Thus, the molarity of the diluted solution is 0.102 M.
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Answer:
0.102 M.
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V1) = 5 mL
Molarity of stock solution (M1) = 5.103 M
Volume of diluted solution (V2) = 250 mL
Molarity of diluted solution (V2) =?
The molarity of the diluted solution can be obtained by using the dilution formula as illustrated below:
M1V1 = M2V2
5.103 × 5 = M2 × 250
25.515 = M2 × 250
Divide both side by 250
M2 = 25.515 / 250
M2 = 0.102 M
Thus, the molarity of the diluted solution is 0.102 M.
Answers
Answer:
6.1 kg
Explanation:
To obtain the total mass of the sample, we must first express each mass of the sample in the same unit of measurement.
Since the SI unit of mass is kilogram (kg), we shall express the total mass of the samples in kilogram (kg).
This is illustrated below:
Mass of the samples are:
M1 = 0.6160959 kg
M2 = 3.225 mg
M3 = 5480.7 g.
Conversion of 3.225 mg to kg
1 mg = 1×10¯⁶ kg
Therefore,
3.225 mg = 3.225 × 1×10¯⁶
3.225 mg = 3.225×10¯⁶ kg
Conversion of 5480.7 g to kg
1000 g = 1 kg
Therefore,
5480.7 g = 5480.7 /1000
5480.7 g = 5.4807 kg
Thus, we can obtain the total mass of the samples as follow:
M1 = 0.6160959 kg
M2 = 3.225×10¯⁶ kg
M3 = 5.4807 kg
Total mass =?
Total mass = M1 + M2 + M3
Total mass = 0.6160959 + 3.225×10¯⁶ + 5.4807
Total mass = 6.096799125 ≈ 6.1 kg
Therefore, the total mass of the samples is approximately 6.1 kg.
Answers
Answer: Lithium and Ethanol
Explanation: As lithium and ethanol both have a density of under
1.000g/ml, they can be supported by the water. Blood and Magnesium are denser than the water and will therefore sink as the water can not support it them.
Answers
The product and balanced net ionic equations for the following reactions are SnCl₂ + 2KMnO₄ ⇒ 2 KCl + Sn(MnO₄)₂.
What is the net ionic equation?
Ionic equations are those equations that happened in an aqueous solution. The chemical equation is expressed in an electrolyte solution is expressed and dissociates ions.
In these reactions, each element or ion is dissociated into differently charged ions in a solution. Each of the ions is shown with different charges.
SnCl₂ + 2KMnO₄ ⇒ 2 KCl + Sn(MnO₄)₂. In the reaction, the tin chloride, and potassium magnesium oxide. It dissociates into charged ions, like potassium chloride and tin magnesium oxide. The chlorine will acquire a negative charge and magnesium oxide get a positive charge.
Thus, the net ionic equation is SnCl₂ + 2KMnO₄ ⇒ 2 KCl + Sn(MnO₄)₂.
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Answer:
The answer to your question is:
Explanation:
Reaction
SnCl₂ + 2KMnO₄ ⇒ 2 KCl + Sn(MnO₄)₂
1 ---- Sn ---- 1
2 ---- K ----- 2
2 ---- Mn ---- 2
8 ---- O ---- 8
2 ---- Cl ---- 2
Organisms with traits that help them survive and reproduce in their environment pass on those traits.
Changes in the environment cause organisms to change.
Organisms naturally select traits that help them survive and reproduce
Answers
In an ecosystem, organisms evolve to make changes to help them survive and reproduce in their environment.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Answers
Answer: .
Explanation:
Temperature of the gas is defined as the degree of hotness or coldness of a body. It is expressed in units like and
These units of temperature are inter convertible.
We are given:
Temperature of the gas = (1mK=0.001 K)
Converting this unit of temperature into by using conversion factor:
Thus
Thus the temperature is .