In this reaction, a tetrahedral intermediate is formed. What is the tetrahedral intermediate called and what does this signify about the molecule

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

Asolution of sodium hydroxide was titrated against a solution of sulfuric acid. how many moles of sodium hydroxide would react with 1 mole of sulfuric acid?

Can someone me with questions 12 and 13 plz.