Question: I wrote:

> 
> Hydrochloric ions can influence the mutual solubility of IL and water **and hence** affect the extraction mechanism.
> 
> 
> 

For several conclusions, I may use this construction. I would like to know how idiomatic is this structure, and what are other alternatives to use for such short conclusions in a sentence.

Answer: 
I would use the following two cases:

> 
> 1. In use
> 2. Available
> 
> 
>
The words on the toilet door "dial" are:

1. **Vacant** (i.e. available, free, unoccupied)
2. **Engaged** (i.e. unavailable, in use, occupied)