You are asked to prepare a ph=3.00 buffer solution starting from 1.25 l of a 1.00m solution of hydrofluoric acid (hf) and an excess of sodium fluoride (naf). part a what is the ph of the hydrofluoric acid solution prior to adding sodium fluoride? express your answer using three significant figures. php h = nothing request answer part b how many grams of sodium fluoride should be added to prepare the buffer solution? neglect the small volume change that occurs when the sodium fluoride is added. express your answer using two significant figures. mm = nothing g

Two horizontal plates with infinite length and width are separated by a distance h in the z direction. the bottom plate is moving at a velocity u. the incompressible fluid trapped between the plates is moving in the positive x-direction with the bottom plate. align gravity with positive z. assume that the flow is fully-developed and laminar. if the systems operates at steady state and the pressure gradient in x-direction can be ignored, do the following: 1. sketch your system 2. identify the coordinate system to be used. 3. show your coordinates and origin point on the sketch. list all your assumptions. 5. apply the continuity equation to your system. nts of navier stokes equations of choice to your system 7. solve the resulting differential equation to obtain the velocity profile within the system make sure to list your boundary conditions. check units of velocity 8. describe the velocity profile you obtain using engineering terminology. sketch that on the same sketch you provided in (1). 9. obtain the equation that describes the volumetric flow rate in the system. check the units.

One number is said to be an "order of magnitude" larger than another number if choose one: a. it is 10 times larger. b. it is 5 times larger. c. it is 3 times larger. d. it is 100 times larger. e. it is 2 times larger.

Ajoint produces movement when its angle decreases. which type of movement is it?