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Question about changing PH from solutions?(Help needed) - Printable Version

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Question about changing PH from solutions?(Help needed) - Gacobe - 05-09-2018

I have a question that I am unable to solve with my almost inexistente skills of math and chemistry, but I am trying to get better at this but I have learning disabilities so it takes me a lot of effort to understand kinda simple things.


It is about PH of solutions.

#1 Question
If I have 100ml of 99% IPA and want it PH to be 9 with 25% ammonia, how many millilitres of ammonia will need to be added to reach that? 

#2 Question
I have 100ml of water with PH 7 and I would like to get it up to 11 witj 25% ammonia, how many millilitres I would need to add to reach that?

#3 Question

If that 100ml of water with ammonia in it with PH 11 will be lowered to PH 9 with 10% vinegar, how much of vinegar will need to be added to reach that? 

I have tired to learn the way to calculate these,  but I can't wrap my mind around these calculations and I am looking in to math at this point to learn those skills that I am missing at this point before I can use those equations needed to get answers. 

Please help me with these,

I'm just learning more about basic chemistry. 

Ps. I only need to know how much many millilitres to add each component.

Thanks already! I know that these are very basic things to many of you and doesn't require any time at all or effort.