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lnQ and logQ are conceptually the same yet matematically not. ln is the natural log or log base e whiles log is just log base 10. Thermo equations use log sometimes when dealing with ph's as it makes it easier to solve for pH or pOH rather than needing to convert between ln and log. You can calculate using either method, yet just keep in mind that you will need to multiply a constant along when using log.
ln and log are not interchangeable. Using ln will give you a different answer than using log. Be sure to apply whatever function the equation uses. As Sahil mentioned, you technically could use ln or log instead of the one in the equation but you would need to use the conversion factor of ln(X) = 2.303log(X) (which is given on the constants and equations sheet) to get the right answer. But instead of going through all of that it is just much easier and quicker to just use the function that the equation says.
They are not interchangeable. If you want to use log instead of ln then remember that ln(X) = 2.303log(X). If an equation has ln, then you should use ln. If an equation has log, then you should use log. This way it's easier to avoid error.
They're "interchangeable" in the sense that you can choose to use log or ln but they're right in saying there is a difference in how you use each one, so you can't just substitute one with the other plainly. ln(X) = 2.303log(X) is the biggest thing to remember when deciding which path to take.
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