index.php multiple loop for different pages.

hi, im pretty new to all this wordpress stuff and could do with some help.
I’m trying to code an index.php that has 1 loop for a ‘News’ page and 1 loop for a ‘Portfolio’ page.
Although I want both loops to do the same thing (display 5 posts),
how do code it so it differentiates between the ‘News’ page and ‘Portfolio’ page.

thanks in advance.