Ontsmet de wond zodat die geneest.

Ontsmet is the imperative form of ontsmetten, meaning to disinfect.
The imperative is used for commands, instructions, or advice.

So:

• ontsmetten = to disinfect
• ontsmet! = disinfect!

In this sentence, it works like an instruction: Disinfect the wound ...

Because Dutch usually leaves out the subject in the imperative.

So instead of saying something like You disinfect the wound, Dutch simply says:

• Ontsmet de wond.

The subject is understood as you. This is very normal in instructions, recipes, manuals, and advice.

De wond means the wound.

• wond = wound
• de = the

The noun wond is a de-word (common-gender noun), which matters later when the sentence uses die to refer back to it.

Zodat means so that here.

It introduces a clause that gives the purpose or intended result of the action:

• Ontsmet de wond zodat die geneest.
• Disinfect the wound so that it heals.

In this sentence, the meaning is mainly one of purpose: you disinfect the wound in order for it to heal.

Because zodat introduces a subordinate clause, and in Dutch subordinate clauses the conjugated verb usually goes to the end.

Compare:

• Main clause: De wond geneest. = The wound heals.
• After zodat: zodat die geneest = so that it heals

This verb-final pattern is very common after words like omdat, zodat, terwijl, als, and dat.

Yes, die often means that or those, but here it is being used to refer back to de wond.

In everyday Dutch, die is often used to point back to a previously mentioned de-word, especially when talking about a thing rather than a person.

So here:

• de wond = the wound
• die = it / that one

A fuller version would be:

• Ontsmet de wond zodat de wond geneest.

But repeating de wond sounds less natural. Using die avoids repetition.

Because geneest is a conjugated verb, while genezen is the infinitive.

Here the subject is singular:

• die = it
• de wond = the wound

So the verb must be third-person singular present tense:

• die geneest = it heals

If the subject were plural, you would get genezen:

• de wonden genezen = the wounds heal

Here genezen means to heal.

In this sentence, the wound itself is the thing that heals:

• de wond geneest = the wound heals

That is slightly different from using genezen for a person recovering:

• Hij geneest snel. = He heals / recovers quickly.

So in this sentence, geneest refers to the wound improving and closing up.

Usually no, not in this sentence.

Om ... te is commonly used when the understood subject of both parts is the same. For example:

• Ik studeer om te slagen.
• I study in order to pass.

Here, however, the person doing the disinfecting is you, but the thing doing the healing is the wound. The subjects are different.

So Dutch normally uses zodat + a full clause:

• Ontsmet de wond zodat die geneest.

That is much more natural than trying to use om te genezen here.

In this sentence, it is mainly expressing purpose.

The idea is:

• Do this so that the wound heals.

In other contexts, zodat can also express result, but with an imperative like Ontsmet de wond, learners should understand it mainly as in order that / so that.

Yes, absolutely.

Both are possible:

• Ontsmet de wond zodat die geneest.
• Ontsmet de wond zodat de wond geneest.

But repeating de wond sounds heavier and less natural. Using die is smoother because it refers back to something just mentioned.

So die is a natural way to avoid repetition.