Posted by SHAKAYLA on .
How many grams of water must be added to 2 grams of a 65% iodine solution in order to produce a 42% iodine solution? Round your answer to the nearest tenth

9th grade science? math? 
Ms. Sue,
After this, please type your school subject in the appropriate box.

9th grade 
bobpursley,
You want to add M grams of water to 2 grams of .65 solution?
amount of iodine in final= amount of iodine in initial
.42(M+2)=.65(2)
solve for M.