Science
posted by Bob .
When 260. mL of 1.50 x 104 M hydrochloric acid is added to 125 mL of 1.75 x 104 M Mg(OH)2, the resulting solution will be

1. Write and balance the equation.
2. Calculate moles of HCl and moles Mg(OH)2, determine which will react completely and which will remain, then calculate pH from that data. Post your work if you get stuck. 
It's basic.