You better watch out... Thats enough to catch a charge in most states. You might want to check your state laws. This is the law in the state I live in:
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HB 1417 makes it a felony for consumers to purchase large quantities of pseudoephedrine, ephedrine, norpseudoephedrine, and phenylpropanolamine. The drugs are commonly found in cold remedies and appetite suppressants, but are also used to manufacture methamphetamines. The new law specifically restricts the sale of products containing the above-mentioned drugs to single transactions of package sizes that contain no more than three grams (about 96 pills). It also restricts the sale of those products to anyone under the age of 18. Law enforcement officials who testified for the bill said the measure would cut off a major, legal supply of a needed ingredient for the illegal manufacture of the drug methamphetamine.
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My guess would be that the amount you stated would be enough to get an "intent to manufacture a controlled substance" charge.