How do you describe the accurarcy and the precision of a given data set?

Find the variance (accuracy) Take the numbers from the stet and subtract the mean value of the data set from each one. Square each of those and add them together. Divide by the number of values you have -1.
To find Precision you take the standard deviation (The square root of the variance) from the set measurements and divide it by the square root of the number samples. 

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.