What is the state of matter of Sodium Bicarbonate?

Answer 1

Powder is a separate state of matter. It does have properties of solid liquid and gas. If you put in iron balls in a jar of powder and shake. The iron balls will rise up (unlike liquid). If you make a small hole at the bottom of jar of powder the rate at which the powder will small depends only on the size of the hole and not on the powder height (unlike liquid). This also explains why hour glasses use powder. It is easier to mark time if hourglasses are filled with powder. Yet you can pour powder like liquid. There are many other properties which makes it a separate state of matter.

Reference: http://arxiv.org/PS_cache/arxiv/pdf/0904/0904.2664v2.pdf

Answer 2

A liquid is often defined as the state of matter in which a substance which has no defined shape, or a substance which will take the shape of its container.

Under this definition, pancake mix is a liquid.

Answer 3

It is usually solid at rtp. However, it can dissolve in water to exist as an aqueous solution.