Answer: Option (b) is the correct answer.
Explanation:
A statement which states a scientifically acceptable general principle that is experimentally tested or verified is defined as a theory.
A theory is the sum of a number of observations which are tested in order to get the true result so that a statement can be framed.
Thus, we can conclude that out of the given options, a theory is a well-tested explanation for a broad set of observations.
Answers and Explanations:
Physical properties are characteristics of substances that can be seen without a change in its chemical composition.
Here, physical properties are:
- density
- color
- luster
- taste
- abundance
- source
I'm not completely sure what you mean by "source", but I'm going to assume you mean the substance's origin found in nature.
Answer:
A.0.51L
B 1.67L
Explanation:
using the formula ;C1V1 =C2V2
15.8×V1=2×4
15.8V1=8
V1=8/15.8
V1=0.51L
apply the same method for B
Answer:
Answer is given below.
Explanation:
<em />
<em>Alkalinity = 400 mg/L in terms of CaCO3 </em>
<em>a.) Total Hardness is defined as the sum of calcium and magnesium iion concentration in terms of CaCO3
</em>
<em>
</em>
<em>Total Hardness = [Ca+2]*{50/20) + [Mg+2]*{50/12) = [200]*{50/20) + [60]*{50/12) = 750 mg/L in terms of CaCO3
</em>
<em>
</em>
<em>b.) Non-Carbonate hardness = Total Hardness - Carbonate Hardness
</em>
<em>
</em>
<em>Now here as the Total Hardness is greater than alkalinity ,Thus
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<em>
</em>
<em>Carbonate Hardness = Alkanlinity = 400 mg/L in terms of CaCO3
</em>
<em>
</em>
<em>Non-Carbonate hardness = 750 - 400 = 350 mg/L in terms of CaCO3
</em>
<em>
</em>
<em>c.) As Total hardness is greater than Alkalinity thus Carbonate hardness is equal to the Alkalinity.
</em>
<em>
</em>
<em>Carbonate hardness = 400 mg/L in terms of CaCO3
</em>
<em>
</em>
<em>d.) Now as the Total hardness of the ground water is more than 180 mg/L,Thus it needs removal of hardness.
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<em>
</em>
<em>There are many treatment options for the removal of hardness:
</em>
<em>i) Ion Exchange method
</em>
<em>ii) Lime soda method</em>
