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Pure Hydrogen chloride is a gas. What volume of HCL (g) (measured at 25 degrees C and 100kPa) would have to be dissolved in 2.00 L of water to produce a solution with pH of 1.25?

Question: As the rocket passes planet X, it fires its engines, producing constant net force on the rocket. State Why, from the point of view on planet X, this constant force results in a decreasing acceleration of the rocket.

Find the volume of the solid of revolution formed when the curve y= x(x^3-3)^2 is rotated about the x axis from x=0 to x=1. Answer: 211/15 (pi)^3 units I keep getting close to the answer but don't know where I made the mistake in the workings. Thanks in advance!

Thank you!

I sort of understand that process. But where do I sub the point (2,-1) into to find the '+c' ?

If the gradient of a curve is given by dy/dx= x/(x^2-1)^2 and the curve passes through (2,-1), find the equation of the curve. Answer: y= -1/2(x^2-1) -5/6 I got part of the answer correct but don't know where the -5/6 came from. Can someone please explain?