What minimum volume of 0.200 m potassium iodide solution is required to completely precipitate all of the lead in 195.0 ml of a 0.194 m lead(ii) nitrate solution?
Answers
2KI + PbNO₃ → K₂NO₃ + PbI₂
The molar ratio of KI to PbNO₃ is 2 : 1
Moles of PbNO₃ present:
Moles = concentration (M) x volume (dm³)
= 0.194 x 0.195
= 0.038
Moles of KI required = 2 x 0.038 = 0.076 moles
concentration = moles / volume
volume = moles / concentration
= 0.076 / 0.2
= 0.38 L = 380 ml
Related Questions
Which statement about the density of warm water is most likely correct?Warm water is more dense than cold water. Warm water is less dense than cold water. The density is the same for warm and cold water. The density will sometimes be higher for warm water and other times higher for cold water.
Why does an ion have an electrical charge?
The ionization energy of an element is a. a measure of its mass b. the energy required to remove an electron from the element in its gaseous state c. the energy released by the element in forming an ionic bond d. the energy released by the element upon receiving an additional electron e. none of the above
Match the electron configuration with its highest principal energy level. Prompt 11s² Answer for prompt 1 1s² Prompt 21s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴ Answer for prompt 2 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴ Prompt 31s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² Answer for prompt 3 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² Prompt 41s² 2s² 2p³ Answer for prompt 4 1s² 2s² 2p³ Prompt 51s² 2s² 2p⁶ 3s² 3p⁶
B.They can only be formed by decay of swamp plants.
C.They take millions of years to form.
D.They can only be formed deep under the sea.
Answers
The answer is: C. They take millions of years to form.
Fossil fuel is a fuel formed by anaerobic decomposition of buried dead organisms.
If there was oxygen the organic matter would not decomposed and formed oil and gas, because there would be reaction of oxidation.
The age of the organisms and their resulting fossil fuels is typically millions of years
Fossil fuel is mixture (solution) consist of several different hydrocarbons (alkanes, alkenes...), aromatic compounds.
A.Calcium and magnesium dissolve in water.
B.Calcium and magnesium evaporate on contact with the walls of the pipe.
C.Calcium and magnesium form precipitates of their respective oxides.
Answers
It's C, calcium and magnesium form precipitates of their respective oxide
Final answer:
The statement 'Calcium and magnesium form precipitates of their respective oxides' best describes the chemical change as it involves a reaction that transforms the calcium and magnesium into new compounds, their oxides, which can clog pipes.
Explanation:
The statement that best describes this change as a chemical change is C. Calcium and magnesium form precipitates of their respective oxides. This represents a chemical change because it involves a reaction that transforms the calcium and magnesium into new substances - their oxides. Here's how it works: in the presence of oxygen, calcium and magnesium in hard water can undergo an oxidation process. During this oxidation, the calcium becomes calcium oxide and the magnesium becomes magnesium oxide. These oxides are less soluble in water and form precipitates, which can accumulate and clog the pipes.
Learn more about Chemical change here:
#SPJ6
Answers
What are two properties of most nonmetals? The two properties of most nonmetals are high ionization energy and poor electrical conductivity. The answer is number 1. The rest of the choices do not answer the question above.
Answers
Answer : The concentration of solution is, 0.45 M
Solution :
The given balanced reaction is,
The moles ratio of and
is, 1 : 1 that means 1 mole of HCl neutralizes by the 1 mole of ammonia.
According to the neutralization law,
where,
= molarity or concentration of
solution = ?
= volume of
solution = 25 ml
= molarity of concentration HCl solution = 0.25 M
= volume of HCl solution = 45 ml
Now put all the given values in the above law, we get the concentration of solution.
Therefore, the concentration of solution is, 0.45 M
no. of mol of hcl = vol. (L) x molarity = 0.045 × 0.25 = 0.01125mol
ratio of hcl:nh3 after balancing eqn = 1:1
no. of mol of nh3 that is completely neutralised by hcl = 0.01125 × 1 = 0.01125mol
therefore, concentration of nh3 = mol / total volume (L) = 0.01125mol / 0.025L= 0.45M
Answers
Answer: (2) structural formula
Explanation:-
The compounds having similar molecular formula but different arrangement of atoms or groups in space are called isomers and the phenomenon is called as isomerism.
1-bromopropane and 2-bromopropane are position isomers which have same molecular formula but different position of the functional groups attached.
The chemical formula for both the compounds 1-bromopropane and 2-bromopropane is . Thus both have same molecular formula , 3 carbon atoms per molecule and 1 bromine atom per molecule.
b.gun powder
c. sugar water
d. steam