Answer and Explanation:
<em>A funnel is in the top of the buret and a beaker is positioned underneath the buret:</em> This is correct and is necessary to fill the buret, but the funnel and the beaker has to be removed before the titration starts. The calculation for moles of analyte does not affect.
<em>A solution is being poured from a bottle into the buret via the funnel:</em> Using a funnel helps to fill the burette but it must be removed to filling the buret at 0.0 mL. In this case, the calculation for moles of analyte do not affect.
<em>Adding titrant past the color change of the analyte solution</em>: In this case, an excess of titrant is added, thus the calculation for moles of anality will be higher than it should be.
<em>Recording the molarity of titrant as 0.1 M rather than its actual value of 0.01 M</em>: In this case, the titrant is considered more concentrated than it is hence, the calculation for moles of anality will be higher than it should be.
<em>Spilling some analyte out of the flask during the titration</em>: The excess of titrant spilled out of the flask higher up the volume of titrant measured. Therefore, the calculation for moles of anality will be higher than it should be.
<em>Starting the titration with air bubbles in the buret</em>: The air inside the burette occupies measured volume, thus the volume of titrant measured will be higher than the real volume spilled in the flask. Hence the calculation for moles of anality will be higher than it should be.
<em>Filling the buret above the 0.0 mL volume mark</em>: Some volume of titrant will be spilled inside the flask but will no be measured since the buret measures the titrant below the 0.0mL mark, thus the calculation for moles of anality will be lower than it should be.
Answer:
conductivity in water/ solid state
Explanation:
becuase, they both dissolve in water the same, therofre it is the least helpful.
Answer:
Explanation:
Kinetic molecular theory of gasses stated that,
1) Gases consist of large number of smaller particles which are distance apart from each others.
2) The gas molecules collide with each other and also with wall of container and this collision is elastic.
3) Gas molecules are in continuous random motion and posses kinetic energy.
4) The forces of attraction between gas molecules are very small and considered negligible.
5) The temperature of gas is directly proportional to average kinetic energy of gas molecules.
Answer:
This is a Redox Titration reaction and the overall ionic equation is given as follows;
2 MnO⁴⁻ + 5C₂O₄
²⁻+ 16H+ → 2Mn²⁺ + 10CO₂ + 8H₂O
From here, we could see that the stoichiometry ratio of KMnO₄ and oxalic acid = 2:5
To calculate the molarity of KMnO₄, we will use the following equation.
x₁M₁V₁= x₂M₂V₂ (1)
Where,
x₁ = 2, stoichiometry number of KMnO₄ in the balanced reaction
x₂ = 5, stoichiometry number of C₂O₄ in the balanced reaction
M₁ and M₂ are the molarities of oxalic acid and KMnO₄ solutions
V1 and V2 are the volumes of oxalic acid and KMnO₄ solutions.
Making M₂, the subject of the formula and substituting the given values, we have,
2M₁V₁ = 5M₂V₂, M₂=2M₁V₁ / 5V₂
= = 2x0.02Mx25mL/
5x42.32mL
M₂=0.0047M
Hence, the molarity of the KMnO4 at endpoint =0.0047M
Answer: the plum pudding model
Explanation:
for A P E X i just took the test
