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Indicator

Low pH color

High pH color

Gentian violet (Methyl violet 10B)

yellow

blue-violet

Leucomalachite green (first transition)

yellow

green

Leucomalachite green (second transition)

green

colorless

Thymol blue (first transition)

red

yellow

Thymol blue (second transition)

yellow

blue

Methyl yellow

red

yellow

Bromophenol blue

yellow

purple

Congo red

blue-violet

red

Methyl orange

red

yellow

Bromocresol green

yellow

blue

Methyl red

red

yellow

Methyl red

red

green

Azolitmin

red

blue

Bromocresol purple

yellow

purple

Bromothymol blue

yellow

blue

Phenol red

yellow

red

Neutral red

red

yellow

Naphtholphthalein

colorless to reddish

greenish to blue

Cresol Red

yellow

reddish-purple

Phenolphthalein

colorless

fuchsia

Thymolphthalein

colorless

blue

Alizarine Yellow R

yellow

red

and here is one you could test in your own garden

Hydrangea flowers

blue

pink to purple

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Q: How do you indicate whether an acid is strong?
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Related questions

What should be pH -value to be strong acid?

The pH will depend on the concentration of the acid, not on whether it is strong or weak.


What should be pH value to be strong acid?

The pH will depend on the concentration of the acid, not on whether it is strong or weak.


What specific property would litmus paper indicate?

It would indicate whether something is an acid or a base.


Is dilute hcl strong acid or weak acid?

Its the other way around, hydrochloric acid is an example of a strong acid, whether dilute or otherwise. The strength of an acid is independent of its concentration.


Is dilute hydrocloric acid a strong acid?

Whether or not an acid is strong doesn't depend on concentration. Most definitions for acid strength depend on the acid dissociation constant (pKa). Strong acids are generally defined as those with a pKa less than -1.74. Since HCl meets this definition, it is a strong acid, regardless of concentration.


How do you know if an acid or base is strong or weak using litmus paper?

Different colors indicate different acidity levels. A deep pink/red is a strong acid and a deep blue is basic.


Can a strong electrolyte be a weak acid?

Strong acid is an expression in relation with the chemical properties of the acid and is used also in physical chemistry; dilute is a term only in relation with the concentration of the acid. Consequently strong acid and concentrated acid are not synonyms and a strong acid can be diluted.


Why carbonic acid list in mineral acid if it is weak acid?

Someone should not have placed carbonic acid in the mineral acid list. For your edification though, whether or not an acid is strong or weak has no bearing on whether or not it is a mineral acid or an organic acid. Mineral acid is any acid comprised of one or more inorganic compounds and dissociate into a hydrogen ion and conjugate base.


Can you know from its name if an acid or base is strong or weak?

It's not possible to determine whether an acid or base is either strong or weak. The only way is to see it's concentration. To determine whether the liquid is an acid or base is easy. An acid's chemical formula always has Hydrogen ions. Example HNO3 or HCl. Bases always have OH or Hydroxide. Example NaOH2.


Is sulphuric acid a strong acid or weak acid?

i thing strong acid


Is HNO3 is strong or weak acid?

It is a strong acid.Actually it is very strong.


Is sulfurous acid a strong acid?

No, it is a weak acid. Sulfuric acid, however is a strong acid