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Prepositions after adjectives

soluble in, by, to, at or for?

Soluble most commonly takes in to describe a substance that can dissolve in a liquid.

Quick answer

Correct preposition with soluble

Use soluble in to describe a substance that can dissolve in a liquid or medium. The combinations soluble by, soluble to, soluble at, and soluble for are generally not standard after soluble.

Salt is soluble in water.
The powder is highly soluble in alcohol.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
soluble in + liquid

Talking about dissolving in a substance

Soluble in is the standard scientific and general English pattern.

Sugar is soluble in hot water.
2
highly soluble in + substance

Describing degree of solubility

Highly soluble in emphasises that something dissolves easily.

The compound is highly soluble in ethanol.
3
slightly soluble in + substance

Describing limited solubility

Slightly soluble in means something dissolves only a little.

The material is slightly soluble in cold water.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
soluble in
The chemical is soluble in water.
able to dissolve in a liquid or medium
soluble by
The stain was removed by heat.
By is not a normal complement after soluble; it may introduce a separate method adjunct.
soluble to
This medicine is acceptable to children.
Soluble to is not standard English.
soluble at
The reaction occurs at high temperatures.
At may introduce conditions, not a complement after soluble.
soluble for
This tool is useful for engineers.
Soluble for is not a standard combination.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using soluble to

Use soluble in when talking about dissolving.

✕ The powder is soluble to water. ✓ The powder is soluble in water.

Using soluble by as a complement

By normally introduces a method, not the medium of dissolving.

✕ Salt is soluble by water. ✓ Salt is soluble in water.

Using soluble for

For does not normally follow soluble.

✕ The substance is soluble for oil. ✓ The substance is soluble in oil.

Confusing conditions with complements

At can describe temperature or pressure, not the solvent itself.

✕ The compound is soluble at water. ✓ The compound is soluble in water.

Quick practice

Choose the expression that matches the intended meaning.

1. Salt is ___ water.
2. The drug is highly ___ alcohol.
3. Which option is standard English?

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Frequently asked questions

What preposition follows soluble?

The normal and standard preposition is in.

Can I say soluble by water?

No. Use soluble in water to describe dissolving.

Is soluble to correct?

No. Soluble to is not a standard English combination.

sacred-to-in-by-of, for "sad for" or "sad about"? "safe for", "safe from" or "safe in"? sanguine about, in, of, on or for? "satisfactory to" or "satisfactory for"? satisfied with, of, by, in or on? "satisfying for" or "satisfying to"? scarce in, for, at, on or of? scared of, to, about, for or by? "scary for" or "scary to"? "scathing about", "scathing in" or "scathing of"? "sceptical about" or "sceptical of"?

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