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Bromocresol purple is an indicator that changes color over a range from pH=5.2 to pH=6.8. What is Ka of bromocresol purple? The sum of the squares of two consecutive off integers is 74. Find the two integers? If you dilute 250mL of a 12.0M solution of HNO3 to a final volume of .500L what will be the concentration of the diluted solution? How do I solve f(x+3) when f(x) = 4-x^2? The rate of change of y with respect to t is proportional to 50 - y?