Phoebe asked in 科學化學 · 1 decade ago


In another experiment, sodium hydroxide solution is added slowly

to the hydrochloric acid to which Universal Indicator solution has been added.

Discuss how the colour changes relate to the substances present

in the solution as the sodium hydroxide solution is added.

Use the substances from the key list.

Key list of substances:


sodium chloride

sodium hydroxide

hydrochloric acid

At the beginning:

When the acid is neutralised:

When further sodium hydroxide is added:



1 Answer

  • 下雪
    Lv 7
    1 decade ago
    Favorite Answer

    the total reaction is

    HCl + NaOH --> NaCl + H2O

    the solution color change depended on your indicator.

    At begining, the color is red or orange red. After sodium hydroxide solution added, the will change from red to ~ (you can see the picture or table, color is depend on pH value)

    Universal Indicator solution

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