Answer:
The concentration of
is 1.48 ×
M
The absolute uncertainty of
is ±0.12 ×
M
The concentration of
is written as 1.48(±0.12) ×
M
Explanation:
The pH of a solution is given by the formula below
pH = ![-log_{10}[{H^{+}]](https://tex.z-dn.net/?f=-log_%7B10%7D%5B%7BH%5E%7B%2B%7D%5D)
∴ ![[H^{+}] = 10^{-pH}](https://tex.z-dn.net/?f=%5BH%5E%7B%2B%7D%5D%20%3D%2010%5E%7B-pH%7D)
where
is the
concentration
From the question,
pH = 8.83±0.04
That is,
pH =8.83 and the uncertainty is ±0.04
First, we will determine
from
![[H^{+}] = 10^{-pH}](https://tex.z-dn.net/?f=%5BH%5E%7B%2B%7D%5D%20%3D%2010%5E%7B-pH%7D)
![[{H^{+}] = 10^{-8.83}](https://tex.z-dn.net/?f=%5B%7BH%5E%7B%2B%7D%5D%20%3D%2010%5E%7B-8.83%7D)
×
M
×
M
The concentration of
is 1.48 ×
M
The uncertainty of
(
) from the equation
is
×
× 
Where
is the uncertainty of
is the uncertainty of the pH
Hence,
= 2.303 × 1.4791 ×
× 0.04
= 1.36 ×
M
= 0.12 ×
M
Hence, the absolute uncertainty of
is ±0.12 ×
M
If two plus two is four then four plus four is two
Answer:

Explanation:
Hello!
In this case, for the described chemical reaction, we find it is:

Because it says that the iron is dissolved in a strong acid which provides addition hydrogen ions to the reaction media. Thus, for the questions attached on the figure we find:
- This a REDOX reaction because we see iron is being oxidized from 2+ to 3+ and manganese reduced from +7 to +2.
- Since it is a redox reaction and the oxidized species is that undergoing an oxidation number increase, we evidence iron goes from +2 to +3, which means iron is the oxidized species.
- In this case, for the used 59.2 mL (0.0592 L) of the 0.2000 M solution of potassium permanganate, we can compute the consumed grams of iron via stoichiometry including the 5:1 mole ratio between them in the chemical reaction:

It means that the percent of iron in that sample is:

Best regards.
Answer:
No
Explanation:
If you added the reactants on the reactant side because there is one atom for nitrogen on the product side while there is two atoms on the product side. There are more hydrogen products on the reactant side as well.
Answer: Bismuth (Bi) , Nitrogen family
Explanation:
As the element has 5 valence electrons in the sixth energy level, which mens it belongs to 6th period as the valence electron has entered the 6th energy level.
Now as the electrons are filled according to afbau's rule , the electronic configuration of the element will be :
![[Xe]4f^{14}5d^{10}6s^26p^3](https://tex.z-dn.net/?f=%5BXe%5D4f%5E%7B14%7D5d%5E%7B10%7D6s%5E26p%5E3)
Now as the atomic number of element is equal to the number of electrons in a neutral atom , the atomic number is 83 and the element is Bismuth (Bi). As the last electron enters p -subshell , it is a p block element. It lies in group 15 which is nitrogen family.