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# Five solutions A, B, C, D, and E when tested with universal indicator showed pH as 4, 1, 11, 7, and 9 respectively. Which solution is?

**(i) **Neutral?

**(ii)** Strongly alkaline?

**(iii) **Strongly acidic?

**(iv) **Weakly acidic?

**(v) **Weakly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration.

i> Neutral-

**Durga's solution is neutral (pH= 7)**ii> Strongly Alkaline-

**Chanda's solution is strongly alkaline (pH=11)**iii> Strongly Acidic-

**Bob's solution is strongly acidic (pH=1)**iv> Weakly Acidic -

**Ali's solution is weakly acidic (pH=4)**v> Weakly Alkaline-

**Emmanuel's solution is weakly alkaline ( pH=9)**

**[Extra information:**pH stands for "power of hydrogen".The "H" is capitalized because it is the hydrogen element symbol.

Acidic and basic are two extremes that describe a chemical property chemical. The pH scale measures how acidic or basic a substance is.

- The pH scale ranges from 0 to 14.
- A pH less than 7 is acidic in nature.
- A pH of 7 is neutral.
- A pH greater than 7 is basic in nature.

pH decreases with an increase in temperature. This does not mean that the water becomes more acidic at higher temperatures.

A solution is considered acidic if there is an excess of hydrogen ions (H) over hydroxide ions (OH-).

(Refer to image for better understanding)

**]**

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