7. 0.986g potassium hydrogen phthalate was used to standardize a sodium hydroxide solution. 14.74mL of the sodium hydroxide solution was used to reach
equivalence.
a. Find the moles of potassium hydrogen phthalate used.
b. Determine the concentration of the sodium hydroxide solution.
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facetic acidis tipated into 250 ml fonM barium budrovide until the

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.