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Yes you can enter basic or complicated expressions, you just can't enter equalities nor equations. The calculator cannot solve equations. When an expression (without an = sign) is entered, pressing the ENTER key will evaluate it.
No, your calculator does not know a variable called theta. But what is theta but a symbol to represent a variable. Usually it is used to represent an angle in polar coordinates. It is just the usage and it is not really essential. You can do conversion from polar to rectangular coordinates and from rectangular to polar coordinates but it does not matter what the angle variable is called. Go ahead, do all the calculations you want that involve an angle. If the calculator can perform them , they will be evaluated correctly and the name you give the angle value (alpha, beta, theta, iota...) is immaterial.
If you have the pH, and want to calculate the concentration that yields that value of the pH, you proceed as follows c[H3O ] = 10^(-pH) Ex pH=8.23 c[H3O ] : [2nd][LOG] [(-)] 8.23 [)] where [(-)] is the change sign key. Here is a screen capture to show you how to calculate the pH (first example) and the concentration (2nd example)
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