Hello!
(Missing Previous Enunciate) <span>Use the Henderson-Hasselbalch equation to find the pH of:
To solve this question we need the pKa of HCOOH, which is
3,75, now, we can apply the
Henderson-Hasselbach equation:
</span>
![pH=pKa+ log( \frac{[HCOONa]}{[HCOOH]} )=3,75 + log( \frac{0,11M}{0,17M} )=3,56](https://tex.z-dn.net/?f=pH%3DpKa%2B%20log%28%20%5Cfrac%7B%5BHCOONa%5D%7D%7B%5BHCOOH%5D%7D%20%29%3D3%2C75%20%2B%20log%28%20%5Cfrac%7B0%2C11M%7D%7B0%2C17M%7D%20%29%3D3%2C56)
<span>
So, the pH of a solution that is 0,17 M in HCHO</span>₂ and 0,11 M in NaCHO₂ is
3,56
Have a nice day!
Answer:
<h2>The answer is 615 g</h2>
Explanation:
The mass of a substance when given the density and volume can be found by using the formula
<h3>mass = Density × volume</h3>
From the question
volume of seawater = 600 mL
density = 1.025 g/mL
The mass is
mass = 600 × 1.025
We have the final answer as
<h3>615 g</h3>
Hope this helps you
Answer: 180g
Explanation:
No of moles= volume ×molarity/1000
Volume is given as 750ml
Molarity is given as 6M
Substitute to get the mole
No of moles = 750×6/1000
No of moles= 4.5moles
Remember that
No of moles also = mass given/molar mass
Molar mass of NaOH
Na= 23
O=16
H=1
Molar mass = na +o+h
Molar mass =23+16+1
Molar mass=40g/mol
Substitute
No of moles = mass given/molar mass
Mass = 4.5×40
Mass = 180g
The mass of NaOH needed is 180g