- What is the molar concentration of H3O+ in a cola that has a pH of 2.670?

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What is the normality of an acid if 21.18 mL were needed to titrate 0.1369 g Na2CO3? Prove that A is dense in X iff A closure equals X. A subset X.? A water supply reservoir has leakage, which kind of glue is effective for it? The function f is f(x)= (x+4)(x-a), the graph of f is a parabola , a is const. The x coord. is b/w 1 and 3, which is a?
A. -2
B. 1
C. 5
D. 9? Im having trouble on these last 2 biology questions I have. Any help would be great. Thank You.?