A theory is a well-tested explanation <span>that uses a broad range of observations.</span> A hypotheses is an explanation for something, but the information is taken from observation, but has not been proved. Most hypotheses can be proven or disproven by further research.
First, we have to change Sr3(ASO4)2 from 0.059 g/L to moles:
and when the molar mass of Sr3(ASO4)2 = 87.6*3 + 74.9*2 + 16*8
= 540.6 g/mol
Molarity (X) = 0.059 g/L * 1 mol / 540.6 g/mol
= 1.1 x 10^-4 moles
When the solubility equation is:
Sr3(ASO4)2 ↔ 3Sr++(aq) + 2ASO-3(aq)
so, Ksp = [Sr++]^3[ASO-3]^2
from ICE table and the balanced equation:
[Sr++] = 3 X
= 3* 1.1 x 10^-4 = 3.3x10^-4 M
[ASO-3] = 2X
= 2* 1.1 x 10^-4 = 2.2 x 10^-4 M
So, by substitution:
∴Ksp = (3.3 x 10^-4)^3 * (2.2 x 10^-4) ^2
= 1.74 x 10^-18
Options are provided in the given question, so the complete question is as follows:
Laboratory equipment is cleaned and properly stored after use primarily so that —
A. chemical products can be measured and recorded as data
B. time is saved in setting up the next experiment
C. toxic materials can be kept in the laboratory
D. the possibility of contamination in the laboratory is minimized
Answer:
D. the possibility of contamination in the laboratory is minimized
Explanation:
After the completion of experiments, all the laboratory equipment should be cleaned and properly stored to minimize the possibility of contamination in the laboratory.
Any contamination in the laboratory can affect the experiment and will not give an accurate result, so it is important to clean and store the equipment properly.
Hence, the correct answer is "D".
Answer: The balanced equation is 
.
Explanation:
A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.
For example, 
Here, number of atoms on reactant side are as follows.
The number of atoms on product side are as follows.
In order to balance this equation, multiply Ca by 5 on reactant side. Multiply V by 2 and CaO by 5 on product side. Therefore, the equation can be rewritten as follows.
Now here, number of atoms on reactant side are as follows.
The number of atoms on product side are as follows.
Since, there are same number of atoms on both reactant and product side. So, the equation is now balanced.
Thus, we can conclude that the balanced equation is .
