3. Refer the given representation of pH scale and answer the following questions -
Neutral
a) What would be the H3O+ conc. of a substance having pH of 3?
b) What would be the nature of the substance having a pH of 112
c) Milk goes sour by lactobacillus bacteria if its pH falls below.
4. A solar cell:
a) First converts solar energy into heat energy and then to electricity.
b) First converts solar energy into light energy and then to electricity.
c) Converts solar energy into electricity.
d) First converts solar energy into magnetic energy and then to electricity.
Answers
Answered by
1
Answer:
3 b. pH scale having measurements about 14,15 not 112.
Answered by
4
Lets see what does pH scale values informs.
Explanation:
Every chemical substance has a certain nature :
- Acidic
- Basic
- Neutral
To know the strength of acidic , basic character and neutrality the pH scale is introduced .
pH scale
It has a value from 0 to 14 .
- The acidic substance has pH value : less than 7
- The basic substance has pH value : more than 7
- The neutral substance has pH value : 7
a)The hydronium ion concentration will be :
pH= - log[H₃O]⁺
[H₃O]⁺= 10⁻³
(b) The substance with pH 12 will be base .
(c) Milk goes sour by lactobacillus bacteria if its pH falls below 7 .
4. Solar cell
It is the cell that converts : (c) the solar energy into electrical energy .
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