- Zinc acetate and potassium hydroxide net ionic equation?

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What is the normality of an acid if 21.18 mL were needed to titrate 0.1369 g Na2CO3? What geologic features are associated with each type of convergent boundary? 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? For what values of k is the following integral improper? upper bound is k, lower bound is 0. (x)/(x^2-19x+90)dx? Prove that A is dense in X iff A closure equals X. A subset X.?