Actually it would depend on how much water you put it in. pH is logarithmic so every time you increase the volume tenfold, you move one pH point further towards neutral. An alkali is a base, and the (Lewis) definition of a base is something that donates an electron pair. This can only be done in an aqueous solution (something dissolved in water). So pH only applies to aqueous solutions.
As a result, solids don't actually have a pH. Even if they did, it wouldn't be a useful measure to tell us anything about the properties of the powder because it isn't exchanging electrons without water. So if you add a tablespoon of water you get something much stronger than if you add a litre of water.
It's also worth noting that the properties of any given substance go beyond their properties as a potential acid or base when added to an aqueous solution. Otherwise we wouldn't need all the other aspects of chemistry.
In the case of bicarbonate of soda, I really wasn't concerned with the strength of the alkaline solution it would produce when dissolved in water. I was concerned with the potential exothermic reaction when mixed with citric acid and the possible scouring (abrasive) properties. You will note I never referred to bicarb as a strong alkaline. It's a common misconception amongst a lot of people that "acidic" or "alkaline" are some sort of shorthand for "dangerous".
Anyway, the pH in and of itself wasn't the issue and isn't the only chemical or physical action taking place here, as I described in a previous post.
My reply is for anyone who wants to learn something about chemistry while randomly scrolling MN. Maybe that's you. Seems unlikely given the oddly aggressive tone of your posts but you never know.
And I'll stick with working in industry thanks, it's better paid, nicer hours, and wouldn't you know, I don't have to deal with the occasional entitled adult bullies who think they know better than the qualified professionals because they think they're fundamentally better than teachers as a whole, or because they secretly feel really scared and small and don't like it and have to lash out at someone else to make themselves feel better about the fact they've peaked in life.