Закваска может перекиснуть.

Закваска is a feminine noun. In everyday Russian, it can mean starter culture, especially for sourdough, fermentation, or cultured dairy products.

In the sentence Закваска может перекиснуть, it most naturally means something like a starter or ferment that can become too sour.

Grammatically:

• dictionary form: закваска
• gender: feminine
• here it is in the nominative singular because it is the subject of the sentence

Russian does not have articles like a or the.

So Закваска can mean:

• the starter
• a starter
• starter in a general sense

Which one sounds best depends on context. If the meaning is already known from the surrounding text, Russian usually does not need to mark this explicitly.

Может is the 3rd person singular of мочь (to be able to / can).

In context, может can often be translated in several ways:

• can
• may
• might

So Закваска может перекиснуть could mean:

• The starter can turn too sour
• The starter may turn too sour
• The starter might over-acidify

The exact English choice depends on tone and context. Russian может is often broader than any one English modal.

After может, Russian normally uses the infinitive of the main verb.

So:

• может = can / may / might
• перекиснуть = to become too sour / to over-acidify

This is the same pattern as in:

• Он может прийти. = He may come.
• Она может забыть. = She might forget.

So literally, the structure is:

• Закваска = the starter
• может = can / may
• перекиснуть = become too sour

Перекиснуть is a verb meaning to become too sour, to over-sour, or to over-ferment in a way that makes something excessively acidic.

It is built from:

• киснуть = to sour, to become acidic
• prefix пере- = often adds the idea of too much, over-, or excess

So:

• киснуть = to go sour
• перекиснуть = to go too sour

That prefix is very common in Russian:

• переварить = overcook
• пересолить = oversalt
• переоценить = overestimate

Перекиснуть is perfective.

That means it presents the change as a completed event or a single result: the starter reaches the state of being too sour.

The imperfective partner is usually перекисать:

• Закваска может перекисать would be less natural in this context unless you are talking about a repeated process or general tendency.
• Закваска может перекиснуть is natural when talking about the possibility that it may end up too sour.

After может, both aspects are possible in Russian, but the choice changes the meaning:

• perfective: possibility of reaching a result
• imperfective: ability/process/habit/repetition

Because it is the subject of the sentence.

In Закваска может перекиснуть:

• закваска = what the sentence is about, the thing that may become too sour
• therefore it is in the nominative singular

You can tell it is the basic dictionary form:

• nominative singular: закваска

Yes. Russian word order is more flexible than English word order.

The neutral order here is:

• Закваска может перекиснуть.

But you might also see:

• Может перекиснуть закваска.

That version is possible, but it sounds more marked and would usually depend on context, emphasis, or style.

The standard, neutral order for learners to use is:

• Закваска может перекиснуть.

The stress is:

• заквАска
• мОжет
• перекиснУть

A rough pronunciation guide:

• заквАска ≈ zah-KVAHS-kah
• мОжет ≈ MO-zhet
• перекиснУть ≈ pe-re-kees-NOOT'

A few useful notes:

• the final -ть in перекиснуть is soft
• unstressed vowels are reduced in normal speech
• ж in может sounds like the s in measure

It describes possibility, not permission.

With things like закваска, может usually means:

• it can happen
• it may happen
• it is possible

So this is not:

• the starter is allowed to become too sour

It is:

• the starter may become too sour
• the starter can over-sour

Yes, it is natural Russian, especially in cooking, baking, and fermentation contexts.

It sounds like something you might hear in:

• a recipe note
• baking advice
• a discussion of sourdough starter
• instructions about fermentation timing

It is fairly concise and natural:

• Закваска может перекиснуть. = The starter may become too sour / over-ferment.

Yes. Перекиснуть can be used for other substances that can become too sour or over-acidified through fermentation or standing too long.

For example, depending on context, it could apply to:

• dough or starter
• fermented mixtures
• some dairy products
• liquids or food that have gone too sour

So the core idea is not just sour, but excessively sour.

Because Russian does not need быть here.

The pattern is simply:

• [subject] + может + infinitive

So:

• Закваска может перекиснуть.

Adding быть would be wrong in this structure.

Compare:

• Он может прийти. = He may come.
• Тесто может подняться. = The dough may rise.
• Закваска может перекиснуть. = The starter may become too sour.

You would usually put не before может:

• Закваска не может перекиснуть.

That usually means:

• The starter cannot become too sour or
• The starter can’t over-ferment

But in real-life usage, depending on context, this could mean either:

• it is impossible, or
• it is not likely under the circumstances

You could also negate the second verb in some contexts, but the normal simple negation is:

• не может перекиснуть