HCl Çözeltisi İlavesi ve İyon Derişimi

7. 200 mL saf suya $X$ M HCl sulu çözeltisi ilave edilmesinde $[H^+]$ iyon derişiminde meydana gelen değişim aşağıdaki grafikte verilmiştir.

[Graph showing $[H^+]$ (mol/L) starting at $10^{-7}$ and reaching $10^{-1}$ at $100$ mL added HCl]

Buna göre HCl çözeltisinin başlangıç derişimi ($X$) kaç molardır?

A) 0,1

B) 0,2

C) 0,3

D) 0,4

E) 0,5

Soruda görsel içerik var: A Cartesian coordinate system graph. The y-axis represents $[H^+]$ concentration in mol/L, with key values $10^{-7}$ and $10^{-1}$ marked. The x-axis represents 'İlave edilen HCl çözeltisi hacmi (mL)' (Volume of HCl solution added). A linear-looking curve starts from $(0, 10^{-7})$ and passes through a point where the added volume is $100$ mL and the concentration reaches $10^{-1}$ mol/L. There are various handwritten circles and scribbles on the graph, including a large blue 'X' mark.