Why on the ph scale does a acid go to 0-6.9 but bases go up to 7.1-14. what happened to the 7.0? does it not mean anything or do anything?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?