Enter those values into an on-line calculator like this:
http://www.brewersfriend.com/mash-chemistry-and-brewing-water-calculator/
Enter a grainbill, and it will tell you what the PH will be, and also tell you if you are within water chemistry. The three common additions you can play with are calcium chloride, gypsum, and epsom salts.
Enter the kind of acid you are using, and if your PH is off, it will tell you how much to add.
Then, you can save the worksheet and bring it up anytime.