In the laboratory, a general chemistry student measured the pH of a 0.313 M aqueous solution of acetylsalicylic acid (aspirin), HC9H7O4 to be 2.031. Use the information she obtained to determine the Ka for this acid.

for the acid is

Explanation:

   c             0             0

So dissociation constant will be:

Give c= 0.313 M and = 2.031

Also

[   

Putting in the values we get:

for the acid is

here's the link to your question!

explanation:

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms