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How does litmus paper indicate an acid?

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.