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What is the ph of 0.1 M nh4cl that hydrolyses in 1 dm3 h2o?Kb =1.8 × 10^-5; log7.42=0.87? Does the addition of distilled water into the vinegar affect the determination of concentration of acid solution? The half-life of Yttrium-91 is 59 days. How much of a 4.11 g sample of Yttrium-91 will remain after 354 days? Can methane in wells discolor the water - to a grey? For what value of c does the quadratic function f(x)=x^2-6x+c have directly one x-intercept?