Two students are working together to make a solution of NaOH in DI water. They are trying to achieve a concentration of 15.0% w/v. They transfer 15.0 g of NaOH into a 100-mL volumetric flask. Then they fill the flask to the etched line with DI water. The NaOH doesn't immediately dissolve. What can be said about the solution "as is", with the NaOH yet to dissolve? I choose letter B , but I still unsure, thanks for the help.