Impurities

Q: If a woman's water breaks during pregnancy, is that water pure or impure. If this water fell on a carpet then how should it be purified?

Q: I once saw some white residue on my washed pants. Our clothes washed in the washing machine never have detergent residue. I don't know why my pants had that. The problem is I didn't know which other clothes were washed with the pants. Are all the clothes impure? Should I repeat any salah?

Q: Does a dog touching a person or their clothing make it necessray for them to shower or change their clothes?

Q:

1. I have a problem of mosquito blood staining my bedding. I therefore wash that part only but do not do so 3x, sometimes only once because the blood is removed. Is this ok?

2. The water that falls elsewhere on my bedding from the washing of the blood, is it considered napaak? Do I have to wash that area where the water fell as well? - since the water has been used to wash blood.

3. Is the area where the above mentioned water fell has dried with no traces of impurity, will it be considered pure?

Q: My wife is suffering from a serious disorder about purity. This is all due to urine.

If a child has urinated on a sofa and if someone sits there after its dried without being cleaned, will the other person be impure? Does he/she have to change their clothes?

If he/she sits somewhere else with those same clothes, would that place also be impure?

My wofe is really not well because of this and she’s always washing things, beds, clothes. etc. 

Q: If you wear a garment for a short amount of time whilst you have your haidh, is the garment considered impure? No impurity has soiled the garment. You'd like to wear it again in a few days time, when you're are in a clean state, is that okay?

Q: Is there a way to differentiate between mazi and mani when I find a stain on my clothing after awaking from sleep?

Q: If there is dry impurity (such as pre-ejaculatory fluid) on a solid item (ex. a cellphone) and some wet hands touched it, then will the hands be considered impure? 

Q: If a dog licks you on clothes or body, what is the correct way to clean it?

There is a famous Hadith which mentions that if a dog licks a utensil, the latter should be cleaned 7 times with water and once with soil. Does this apply to just utensils or clothes/body as well?

Q: Is pre-coital fluid considered najaasate ghaleeza or khafeefah?

Will it invalidate salaah?