The PH level of the surface of the water is 9.0
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If the temperature increases the pressure increases. If the temperature decreases the pressure decreases I hope this helped
Answer:

Explanation:
We know that , the reaction between NaOH and HCl is given as

Form the above reaction we can say that
Number of moles of HCl =Number of moles of NaOH

Therefore



Therefore the numbers of moles needed of HCl wil be 
Answer:
Density= 0.4412g/cm^3
Explanation:
When finding density the formula is mass divided by volume. So the mass of 15g divided by 34cm^3 equals to the density of 0.4412g/cm^3.