komugiko wo mizu de toku.

It is read こむぎこ.

• 小麦 = wheat
• 粉 = flour / powder

So 小麦粉 means wheat flour, or just flour in many contexts.

を marks the direct object of the verb.

In 小麦粉を水で溶く, the thing being acted on is 小麦粉.
That is the thing you are dissolving or mixing into liquid.

So:

• 小麦粉を = the flour as the object
• 溶く = to dissolve / to mix so that it loosens into liquid

Here, で shows the means or medium used to do the action.

So 水で溶く means something like:

• dissolve it using water
• mix it with water
• loosen it with water

In other words, water is the substance used to carry out the action.

This is a very common question, because both can appear with 溶く, but the nuance changes.

• Xを水に溶く = dissolve X in water
  
  • This sounds more like focusing on the result: X ends up in water.
• Xを水で溶く = dissolve/mix X using water
  
  • This focuses more on water as the means.

With 小麦粉, 水で溶く is especially natural in cooking, because flour does not fully dissolve the way sugar or salt does. It is more like mixing it with water until smooth.

So in this sentence, で fits the practical cooking sense very well.

Yes, that is a good observation.

In English, dissolve may sound a little odd with flour. In Japanese cooking language, however, 溶く can be used more broadly for things like:

• mixing flour with water
• loosening a powder in liquid
• making a smooth liquid mixture

So here 溶く is closer to:

• mix with water
• make into a slurry
• thin out with water

It does not necessarily imply a perfect chemical dissolving.

Both can be translated as mix, but they are not exactly the same.

• 混ぜる = to mix, combine
  • very general
• 溶く = to dissolve, loosen into liquid, mix into a liquid until smooth
  • more specific

So:

• 小麦粉を水で混ぜる = mix flour with water
• 小麦粉を水で溶く = mix the flour into water so it becomes smooth / loosened

In cooking, 溶く often suggests that the final state is more liquid or evenly dispersed.

Japanese often leaves out the subject when it is obvious from context.

So 小麦粉を水で溶く。 does not explicitly say:

• I dissolve flour in water
• You dissolve flour in water
• One dissolves flour in water

It just states the action itself.

This is very common in:

• recipes
• instructions
• notes
• simple descriptions of actions

The dictionary form is often used in Japanese for:

• recipe steps
• instructions
• demonstrations
• neutral descriptions of actions

So 小麦粉を水で溶く。 can sound like a recipe instruction such as:

• Mix the flour with water.

Japanese does not always use an imperative form for instructions. The plain form is often enough, especially in recipes.

By itself, 水 just means water. It does not specify temperature.

If the speaker wanted to be specific, they might say:

• 冷水で = with cold water
• ぬるま湯で = with lukewarm water
• お湯で = with hot water

So this sentence only tells you that water is used, not what kind.

The basic order here is very natural:

• 小麦粉を 水で 溶く

Japanese word order is more flexible than English because particles show each word’s role. So you may also see variations such as:

• 水で小麦粉を溶く

This still means the same thing.

That said, the original order is probably the most straightforward for learners.

No. Normal Japanese writing usually does not use spaces between words.

So this would normally be written as:

小麦粉を水で溶く。

The spaces are often added only in teaching materials to make the sentence easier to read.

Japanese does not use articles like a, an, or the.

So 小麦粉 can mean:

• flour
• some flour
• the flour

The exact meaning depends on context.

In a recipe, it often just means the flour or some flour being used in that step.

Yes, in some contexts Japanese uses related verbs and kanji, such as:

• 溶く（とく） = to dissolve
• 溶かす（とかす） = to dissolve something
• 溶ける（とける） = to dissolve, melt on its own

Learners often notice 溶く and 溶かす because both can be translated similarly. In modern everyday Japanese, 溶かす is often the more common transitive form for many situations, but 溶く is also used, especially in set expressions and cooking language.

So this sentence is understandable and natural in a cooking-type context.

Yes, especially in a cooking context.

It sounds like a short recipe instruction or procedural step. A more detailed version might be:

• 小麦粉を水でよく溶く。 = Mix the flour well with water.
• 小麦粉を水で溶いておく。 = Mix the flour with water in advance.

But the short sentence 小麦粉を水で溶く。 is perfectly normal as a basic instruction.