Baking soda is a very fine powder. Any good vacuum should do the job fine, but be prepared to replace the bag many times if you have a lot of it to get up. If it's been wet and then stuck to the carpet, just scrape at it with a dull knife to loosen it up off the carpet. Scrape, vacuum, scrape, vacuum, and so on until it's up. Be careful to not damage your carpet by scraping too hard.
Blessings!
Becky
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