# What is the formula for cupric cyanide?

##### 1 Answer

The formula for cupric cyanide is

#### Explanation:

The cupric ion (from the latin "cuprum", corresponding to **copper(II)** ion, with a charge of

The cyanide ion has a charge of

All ionic compounds' charges must **add up to** the net charge, so the number of positive ions and negative ions must be such that the total positive charge plus the total negative charge **equals** the net charge.

Since the cupric ion has a charge of **two** cyanide ions **for every** cupric ion.

Therefore, the formula for **cupric cyanide** contains *one* cupric ion and *two* cyanide ions, and the formula is *copper(II) cyanide*.

#"Cu"^(2+) + "2CN"^(-)# #rarr# #"Cu(CN)"_2#