pH of ammonium carbonate

[Draco]

I can't remember what pH ammonium carbonate is.
I've searched http://en.wikipedia.org.wiki/Ammonium_carbonate but I can't find the answer there.
I need to know the pH so I can find out if phenolphthalein would work better in a titration with HCl than screened methyl orange would.
Thanks for the help.

[blcr11]

A solution of 100g/l in water at 20 C has a pH of 9.

[Draco]

And that would make the phenolphthalein the better indicator, right?

[blcr11]

I don't recall the indicator points for the two dyes. Whichever is closer to pH 9, I suppose would be the indicator of choice.

[MichaelXY]

PHP should work at pH of 9.
http://en.wikipedia.org/wiki/Phenolphthalein