Ionic Premium Plant nutrient Starter kit

I was got this starter kit for free at a hydroponic shop because they made a mistake with what i ordered and i was wondering if these nutrients are for soil because on all 3 quart bottles of grow, bloom and pk boost it said that the target ph is 5.8 -6.2. Isn't that for hydroponics? So if any of you use this for soil what do you guys think about theses nutrients?