Answer:
See explanation
Explanation:
A titration involves the addition of a titrant to an analyte solution. It is a method of volumetric analysis.
When a particular volume of titrant is added, the colour changes to signal the end point of the reaction.
The point at which the colour changes is called the equivalence point. This is the point at which the amount of titrant added is just enough to completely neutralize the analyte solution.
Hence the volume NaOH that needs to be added to the beaker containing HCl to cause a colour change is the volume of NaOH that is just enough to completely neutralize the HCl solution.
Answer:
- [HOCl] = 0.00909 mol/liter
- [H₂O] = 0.03901 mol/liter
- [Cl₂O] = 0.02351 mol/liter
Explanation:
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<u>1. Chemical reaction:</u>
<u>2. Initial concentrations:</u>
i) 1.3 g H₂O
- Number of moles = 1.3g / (18.015g/mol) = 0.07216 mol
- Molarity, M = 0.07216 mol / 1.5 liter = 0.0481 mol/liter
ii) 2.2 g Cl₂O
- Number of moles = 2.2 g/ (67.45 g/mol) = 0.0326 mol
- Molarity = 0.0326mol / 1.5 liter = 0.0217 mol/liter
<u>3. ICE (Initial, Change, Equilibrium) table</u>
I 0.0481 0.0326 0
C -x -x +x
E 0.0481-x 0.0326-x x
<u />
<u>4. Equilibrium expression</u>
![K_c=\dfrac{[HOCl]^2}{[H_2O].[Cl_2O]}](https://tex.z-dn.net/?f=K_c%3D%5Cdfrac%7B%5BHOCl%5D%5E2%7D%7B%5BH_2O%5D.%5BCl_2O%5D%7D)
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<u>5. Solve:</u>
Use the quadatic formula:
The positive result is x = 0.00909
Thus the concentrations are:
- [HOCl] = 0.00909 mol/liter
- [H₂O] = 0.0481 - 0.00909 = 0.03901 mol/liter
- [Cl₂O] = 0.0326 - 0.00909 = 0.02351 mol/liter
Ernest Rutherford was a famous British physicist who lived and worked in the 19th and the first half of the 20th century. He is now considered to be the father of nuclear physics, given that he was the one responsible for figuring out about the nuclear structure of an atom (proton, electron, neutron) and about the nuclear processes in general. The element rutherfordium (Rf) is named after this scientist. When it comes to his personal life, his parents are both British, however, Ernest was born in New Zealand because his mom and dad before he was born. He worked as a professor in several universities, and was even knighted in 1914. He is a Nobel prize winner, which he won for Chemistry in 1908.
The peaks are there where the centre of the concentric circles lie. (Not circles exactly)
You can count a total 4 of them.
So there are a total of 4 peaks
See the attachment. I have marked them with a cross.
Answer:
A tin atom and 2 molecules containing two hydrogen atoms bonded to one oxygen atom.
Explanation:
Equation of reaction:
SnO2 + 2H2 ---> Sn + 2H2O
According to Dalton's postulates:
1. All elements are made up of small indivisible particles called atoms
2. The atom cannot be created nor destroyed
3. The atoms of the same element are alike in every aspect and differ from atoms of all other elements
4. During a chemical reaction there is a combination of atoms in small whole numbers.
From the given options, the one that satisfies the postulates of Dalton is:
"A tin atom and 2 molecules containing two hydrogen atoms bonded to one oxygen atom"
This is because it gives a balanced chemical equation for the number of atoms reacting for each element is equal to the number of atoms of each element produced. This is in accordance with the postulate that atoms are neither created nor destroyed.
The three other postulates are also obeyed. The small whole number ratio for the reactants and products in the chemical reaction is 1 : 2 : 2.
