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28 February, 18:51

Which substance has the lowest pH?

NaOH

Tap water

Lemon juice

Blood

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Answers (1)
  1. 28 February, 20:05
    0
    Lemon juice has lowest pH.

    Explanation:

    pH is the negative log of hydrogen ion concentration. By increasing the Hydrogen ion concentration pH will decrease.

    pH = - log [H⁺]

    According to pH scale,

    The pH of 7 is consider neutral. The pH below the 7 is consider acidic and above the 7 is basic.

    The sodium hydroxide is strongest base because it fully dissociate into ions.

    It dissociate to gives the sodium and hydroxyl ions and solution became more basic.

    NaOH → Na⁺ (aq) + OH⁻ (aq)

    Its pH is 12. It is also known as caustic soda.

    The pH of blood is vary from 7.35 - 7.45. it is slightly alkaline.

    The pH of lemon juice is ranging between 2-3.

    The pH of tap water is ranging between 6-8.5.

    From above given information it can be noticed that lemon juice have lowest pH i. e 2-3. It is acidic, because its pH is less than 7.
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