pH 10. pH 0.5. So­lu­tions with a pH value below 7.0 are con­sid­ered acidic, whereas so­lu­tions with pH values above 7.0 are basic.
http://en.globalquiz.org/question/which-ph-number-describes-a-substance-that-is/
Foods that create an acidic environment in the body include most processed foods, meat and fish, rice, cereal grains, sweeteners and sweetened foods, breads, pastas, cheese, caffeinated drinks, alcohol and condiments. Some nuts and seeds are acid-forming as well.
http://www.livestrong.com/article/305189-a-list-of-acid-alkaline-neutral-foods/
On this scale, a 7.0 measures neutral — neither acidic nor alkaline. Water is a 7.0. Anything measuring a pH of 6.9 or below is considered an acid; anything 7.1 and above is considered an alkali or base. Generally, fruits are the most acidic foods:
http://goaskalice.columbia.edu/answered-questions/which-foods-are-acidic
Neutral Foods. Neutral foods have neither an acidic nor alkaline effect on the body when consumed. Neutral foods include unsalted, fresh butter; fresh, raw cream; raw cow's milk and whey; and margarine and oils.
http://www.livestrong.com/article/305189-a-list-of-acid-alkaline-neutral-foods/
Alkaline Foods versus Acid Foods or Uric Acid Foods. If you're wondering how your diet stacks up, check out the table below. This table includes a listing of 114 commonly consumed foods and their PRAL scores. A negative PRAL score indicates the food is basic/alkaline. A positive PRAL score indicates the food is acidic.
http://www.acidalkalinediet.net/acid-alkaline-food-chart.php
Members of our group would each take a torch to different foods—meats, fruits, and vegetables—and then put the various ashes in water to see whether the liquid became more acidic or more alkaline. Processed meats and processed foods in general tend to produce acidic mineral ions. Most whole foods—fruits, vegetables, seeds, and nuts—tend to produce alkaline mineral ions. But you don’t want to get bent out of shape over some natural foods—cashews, for example—that produce acidic results.
https://www.tylertolman.com/health-articles/alkaline-and-acidic-foods/
The theory is that some foods, like meat, wheat, refined sugar, and processed foods, cause your body to produce acid, which is bad for you. Eating specific foods that make your body more alkaline, on the other hand, can protect against those conditions as well as shed pounds.
http://www.webmd.com/diet/a-z/alkaline-diets
Nowadays there’s a lot of talk about alkaline and acidic foods and maintaining the body in an alkaline state. Whether the food itself is alkaline or acidic is not the issue but rather how it ultimately affects body chemistry. In simplest terms, our bodies are alkaline by nature but acidic by function.
https://www.tylertolman.com/health-articles/alkaline-and-acidic-foods/
Alkaline-Acid Food Charts. Scientists can tell how foods will react inside the body by incinerating the food and analyzing the mineral content of its ash. If the mineral content is highly alkaline, then the food will likely have an alkalizing effect on the body, and vice versa. In other words, how the body reacts to certain foods is what determines what foods are alkaline-forming and what foods are acid-forming. For example lemons are acidic in nature, but have an alkalizing effect on the body once they are digested. Similarly, milk is alkaline outside the body, but acidic upon digestion.
http://greenopedia.com/alkaline-acid-food-chart/
Most fruits and vegetables, soybeans and tofu, and some nuts, seeds, and legumes are alkaline-promoting foods, so they're fair game. Dairy, eggs, meat, most grains, and processed foods, like canned and packaged snacks and convenience foods, fall on the acid side and are not allowed. Most books that tout the alkaline diet say you shouldn't have alcohol or caffeine, either.
http://www.webmd.com/diet/a-z/alkaline-diets
foods that are neither alkaline or acidic
Foods that are neither alkaline or acidic are unsalted fresh butter, fresh raw cream,  raw cow's milk and whey, and margarine and oils. Butter, raw cream, raw cow's milk and whey and margarine and oils are foods that are neither alkaline or acidic.