How to completely remove apps from an iphone 5?

Okay so I checked the amount of space i have and 2.5GB are taken up by apps alone and I only have 7 that are like 20MB each so i thin thats just ridiciculous, So i went to my appstore and saw that 62 apps were purchased but 55 of these i've uninstalled. I believe these are taken up my space without being on my phone, is there any way I can remove them?

No need to remove from your Appstore/iTunes. Can't take up space without being on the phone. You're not accounting for in-app activity of the seven on there. Whatsapp, Viber, Facebook, gaming, whatever, the real time content you do in the app stays with the apps on the phone. You likely have a lot of content in each app. 2.5gb for apps/content isn't bad. That's better than having 50 loaded and only using 5 with the other 45 taking up space. Back up the phone's data, hard reset it and then reload it with what you want if you need the phone to lose some weight. Best luck.